diff --git a/app/_locales/en/messages.json b/app/_locales/en/messages.json
index ee6437116..2bfe0ef07 100644
--- a/app/_locales/en/messages.json
+++ b/app/_locales/en/messages.json
@@ -794,6 +794,12 @@
   "minutesShorthand": {
     "message": "Min"
   },
+  "mobileSyncTitle": {
+    "message": "Sync accounts with mobile"
+  },
+  "mobileSyncText": {
+    "message": "Please enter your password to confirm it's you!"
+  },
   "myAccounts": {
     "message": "My Accounts"
   },
@@ -1333,6 +1339,27 @@
   "symbolBetweenZeroTwelve": {
     "message": "Symbol must be between 0 and 12 characters."
   },
+  "syncWithMobile": {
+    "message": "Sync with mobile"
+  },
+  "syncWithMobileTitle": {
+    "message": "Sync with mobile"
+  },
+  "syncWithMobileDesc": {
+    "message": "You can sync your accounts and information with your mobile device. Open the MetaMask mobile app, go to \"Settings\" and tap on \"Sync from Browser Extension\""
+  },
+  "syncWithMobileDescNewUsers": {
+    "message": "If you just open the MetaMask Mobile app for the first time, just follow the steps in your phone."
+  },
+  "syncWithMobileScanThisCode": {
+    "message": "Scan this code with your MetaMask mobile app"
+  },
+  "syncWithMobileBeCareful": {
+    "message": "Make sure nobody else is looking at your screen when you scan this code"
+  },
+  "syncWithMobileComplete": {
+    "message": "Your data has been synced succesfully. Enjoy the MetaMask mobile app!"
+  },
   "takesTooLong": {
     "message": "Taking too long?"
   },
diff --git a/app/scripts/controllers/preferences.js b/app/scripts/controllers/preferences.js
index 565f4f292..584b6bc51 100644
--- a/app/scripts/controllers/preferences.js
+++ b/app/scripts/controllers/preferences.js
@@ -18,7 +18,9 @@ class PreferencesController {
    * @property {object} store.assetImages Contains assets objects related to assets added
    * @property {boolean} store.useBlockie The users preference for blockie identicons within the UI
    * @property {object} store.featureFlags A key-boolean map, where keys refer to features and booleans to whether the
-   * user wishes to see that feature
+   * user wishes to see that feature.
+   *
+   * Feature flags can be set by the global function `setPreference(feature, enabled)`, and so should not expose any sensitive behavior.
    * @property {object} store.knownMethodData Contains all data methods known by the user
    * @property {string} store.currentLocale The preferred language locale key
    * @property {string} store.selectedAddress A hex string that matches the currently selected address in the app
@@ -33,6 +35,11 @@ class PreferencesController {
       tokens: [],
       suggestedTokens: {},
       useBlockie: false,
+
+      // WARNING: Do not use feature flags for security-sensitive things.
+      // Feature flag toggling is available in the global namespace
+      // for convenient testing of pre-release features, and should never
+      // perform sensitive operations.
       featureFlags: {},
       knownMethodData: {},
       currentLocale: opts.initLangCode,
@@ -52,6 +59,10 @@ class PreferencesController {
     this.store = new ObservableStore(initState)
     this.openPopup = opts.openPopup
     this._subscribeProviderType()
+
+    global.setPreference = (key, value) => {
+      return this.setFeatureFlag(key, value)
+    }
   }
 // PUBLIC METHODS
 
diff --git a/app/scripts/metamask-controller.js b/app/scripts/metamask-controller.js
index 6555f179d..41c3e3642 100644
--- a/app/scripts/metamask-controller.js
+++ b/app/scripts/metamask-controller.js
@@ -56,6 +56,7 @@ const EthQuery = require('eth-query')
 const ethUtil = require('ethereumjs-util')
 const sigUtil = require('eth-sig-util')
 
+
 module.exports = class MetamaskController extends EventEmitter {
 
   /**
@@ -410,6 +411,9 @@ module.exports = class MetamaskController extends EventEmitter {
       checkHardwareStatus: nodeify(this.checkHardwareStatus, this),
       unlockHardwareWalletAccount: nodeify(this.unlockHardwareWalletAccount, this),
 
+      // mobile
+      fetchInfoToSync: nodeify(this.fetchInfoToSync, this),
+
       // vault management
       submitPassword: nodeify(this.submitPassword, this),
 
@@ -586,6 +590,60 @@ module.exports = class MetamaskController extends EventEmitter {
     })
   }
 
+  /**
+   * Collects all the information that we want to share
+   * with the mobile client for syncing purposes
+   * @returns Promise<Object> Parts of the state that we want to syncx
+   */
+   async fetchInfoToSync () {
+    // Preferences
+    const {
+      accountTokens,
+      currentLocale,
+      frequentRpcList,
+      identities,
+      selectedAddress,
+      tokens,
+    } = this.preferencesController.store.getState()
+
+    const preferences = {
+      accountTokens,
+      currentLocale,
+      frequentRpcList,
+      identities,
+      selectedAddress,
+      tokens,
+    }
+
+    // Accounts
+    const hdKeyring = this.keyringController.getKeyringsByType('HD Key Tree')[0]
+    const hdAccounts = await hdKeyring.getAccounts()
+    const accounts = {
+      hd: hdAccounts.filter((item, pos) => (hdAccounts.indexOf(item) === pos)).map(address => ethUtil.toChecksumAddress(address)),
+      simpleKeyPair: [],
+      ledger: [],
+      trezor: [],
+    }
+
+    // transactions
+
+    let transactions = this.txController.store.getState().transactions
+    // delete tx for other accounts that we're not importing
+    transactions = transactions.filter(tx => {
+      const checksummedTxFrom = ethUtil.toChecksumAddress(tx.txParams.from)
+      return (
+        accounts.hd.includes(checksummedTxFrom)
+      )
+    })
+
+    return {
+      accounts,
+      preferences,
+      transactions,
+      network: this.networkController.store.getState(),
+    }
+  }
+
   /*
    * Submits the user's password and attempts to unlock the vault.
    * Also synchronizes the preferencesController, to ensure its schema
diff --git a/docs/README.md b/docs/README.md
index c6e7dae6c..3c9bc0b4a 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -18,3 +18,4 @@ To learn how to develop MetaMask-compatible applications, visit our [Developer D
 - [How to manage notices that appear when the app starts up](./notices.md)
 - [How to port MetaMask to a new platform](./porting_to_new_environment.md)
 - [How to generate a visualization of this repository's development](./development-visualization.md)
+- [How to add a feature behind a secret feature flag](./secret-preferences.md)
diff --git a/docs/secret-preferences.md b/docs/secret-preferences.md
new file mode 100644
index 000000000..f9d01a503
--- /dev/null
+++ b/docs/secret-preferences.md
@@ -0,0 +1,10 @@
+# Secret Preferences
+
+Sometimes we want to test a feature in the wild that may not be ready for public consumption.
+
+One example is our "sync with mobile" feature, which didn't make sense to roll out before the mobile version was live.
+
+To enable features like this, first open the background console, and then you can use the global method `global.setPreference(key, value)`.
+
+For example, if the feature flag was a booelan was called `mobileSync`, you might type `setPreference('mobileSync', true)`.
+
diff --git a/gulpfile.js b/gulpfile.js
index 31888faac..c672a9eff 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -304,6 +304,7 @@ createTasksForBuildJsMascara({ taskPrefix: 'dev:mascara:js', devMode: true })
 function createTasksForBuildJsUIDeps ({ dependenciesToBundle, filename }) {
   const destinations = browserPlatforms.map(platform => `./dist/${platform}`)
 
+
   const bundleTaskOpts = Object.assign({
     buildSourceMaps: true,
     sourceMapDir: '../sourcemaps',
@@ -512,6 +513,8 @@ function generateBundler (opts, performBundle) {
   bundler.transform(envify({
     METAMASK_DEBUG: opts.devMode,
     NODE_ENV: opts.devMode ? 'development' : 'production',
+    PUBNUB_SUB_KEY: process.env.PUBNUB_SUB_KEY || '',
+    PUBNUB_PUB_KEY: process.env.PUBNUB_PUB_KEY || '',
   }), {
     global: true,
   })
diff --git a/mascara/src/app/buy-ether-widget/index.js b/mascara/src/app/buy-ether-widget/index.js
index c60221a0a..c8530ba4c 100644
--- a/mascara/src/app/buy-ether-widget/index.js
+++ b/mascara/src/app/buy-ether-widget/index.js
@@ -2,7 +2,7 @@ import React, { Component } from 'react'
 import PropTypes from 'prop-types'
 import classnames from 'classnames'
 import {connect} from 'react-redux'
-import {qrcode} from 'qrcode-npm'
+import {qrcode} from 'qrcode-generator'
 import copyToClipboard from 'copy-to-clipboard'
 import ShapeShiftForm from '../shapeshift-form'
 import {buyEth, showAccountDetail} from '../../../../ui/app/actions'
diff --git a/mascara/src/app/shapeshift-form/index.js b/mascara/src/app/shapeshift-form/index.js
index 6f3307487..fe7f7ffcb 100644
--- a/mascara/src/app/shapeshift-form/index.js
+++ b/mascara/src/app/shapeshift-form/index.js
@@ -1,7 +1,7 @@
 import React, { Component } from 'react'
 import PropTypes from 'prop-types'
 import classnames from 'classnames'
-import {qrcode} from 'qrcode-npm'
+import qrcode from 'qrcode-generator'
 import {connect} from 'react-redux'
 import {shapeShiftSubview, pairUpdate, buyWithShapeShift} from '../../../../ui/app/actions'
 import {isValidAddress} from '../../../../ui/app/util'
diff --git a/package-lock.json b/package-lock.json
index 3d3d38b19..739a0f57e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2761,11 +2761,18 @@
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-4.2.0.tgz",
       "integrity": "sha512-c+R/U5X+2zz2+UCrCFv6odQzJdoqI+YecuhnAJLa1zYaMc13zPfwMwZrr91Pd1DYNo/yPRbiM4WVf9whgwFsIg==",
-      "dev": true,
       "requires": {
         "es6-promisify": "^5.0.0"
       }
     },
+    "agentkeepalive": {
+      "version": "3.5.2",
+      "resolved": "https://registry.npmjs.org/agentkeepalive/-/agentkeepalive-3.5.2.tgz",
+      "integrity": "sha512-e0L/HNe6qkQ7H19kTlRRqUibEAwDK5AFk6y3PtMsuut2VAH6+Q4xZml1tNDJD7kSAyqmbG/K08K5WEJYtUrSlQ==",
+      "requires": {
+        "humanize-ms": "^1.2.1"
+      }
+    },
     "airbnb-js-shims": {
       "version": "1.4.1",
       "resolved": "https://registry.npmjs.org/airbnb-js-shims/-/airbnb-js-shims-1.4.1.tgz",
@@ -6424,8 +6431,7 @@
     "component-emitter": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/component-emitter/-/component-emitter-1.2.1.tgz",
-      "integrity": "sha1-E3kY1teCg/ffemt8WmPhQOaUJeY=",
-      "dev": true
+      "integrity": "sha1-E3kY1teCg/ffemt8WmPhQOaUJeY="
     },
     "component-inherit": {
       "version": "0.0.3",
@@ -6572,6 +6578,11 @@
       "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.0.6.tgz",
       "integrity": "sha1-4wOogrNCzD7oylE6eZmXNNqzriw="
     },
+    "cookiejar": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/cookiejar/-/cookiejar-2.1.2.tgz",
+      "integrity": "sha512-Mw+adcfzPxcPeI+0WlvRrr/3lGVO0bD75SxX6811cxSh1Wbxx7xZBGK1eVtDf6si8rg2lhnUjsVLMFMfbRIuwA=="
+    },
     "copy-concurrently": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/copy-concurrently/-/copy-concurrently-1.0.5.tgz",
@@ -7504,8 +7515,7 @@
     "data-uri-to-buffer": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/data-uri-to-buffer/-/data-uri-to-buffer-1.2.0.tgz",
-      "integrity": "sha512-vKQ9DTQPN1FLYiiEEOQ6IBGFqvjCa5rSK3cWMy/Nespm5d/x3dGFT9UBZnkLxCwua/IXBi2TYnwTEpsOvhC4UQ==",
-      "dev": true
+      "integrity": "sha512-vKQ9DTQPN1FLYiiEEOQ6IBGFqvjCa5rSK3cWMy/Nespm5d/x3dGFT9UBZnkLxCwua/IXBi2TYnwTEpsOvhC4UQ=="
     },
     "date-format": {
       "version": "1.2.0",
@@ -7613,8 +7623,7 @@
     "deep-is": {
       "version": "0.1.3",
       "resolved": "https://registry.npmjs.org/deep-is/-/deep-is-0.1.3.tgz",
-      "integrity": "sha1-s2nW+128E+7PUk+RsHD+7cNXzzQ=",
-      "dev": true
+      "integrity": "sha1-s2nW+128E+7PUk+RsHD+7cNXzzQ="
     },
     "deepmerge": {
       "version": "0.2.10",
@@ -7697,7 +7706,6 @@
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/degenerator/-/degenerator-1.0.4.tgz",
       "integrity": "sha1-/PSQo37OJmRk2cxDGrmMWBnO0JU=",
-      "dev": true,
       "requires": {
         "ast-types": "0.x.x",
         "escodegen": "1.x.x",
@@ -7707,8 +7715,7 @@
         "esprima": {
           "version": "3.1.3",
           "resolved": "https://registry.npmjs.org/esprima/-/esprima-3.1.3.tgz",
-          "integrity": "sha1-/cpRzuYTOJXjyI1TXOSdv/YqRjM=",
-          "dev": true
+          "integrity": "sha1-/cpRzuYTOJXjyI1TXOSdv/YqRjM="
         }
       }
     },
@@ -9066,14 +9073,12 @@
     "es6-promise": {
       "version": "4.2.4",
       "resolved": "https://registry.npmjs.org/es6-promise/-/es6-promise-4.2.4.tgz",
-      "integrity": "sha512-/NdNZVJg+uZgtm9eS3O6lrOLYmQag2DjdEXuPaHlZ6RuVqgqaVZfgYCepEIKsLqwdQArOPtC3XzRLqGGfT8KQQ==",
-      "dev": true
+      "integrity": "sha512-/NdNZVJg+uZgtm9eS3O6lrOLYmQag2DjdEXuPaHlZ6RuVqgqaVZfgYCepEIKsLqwdQArOPtC3XzRLqGGfT8KQQ=="
     },
     "es6-promisify": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/es6-promisify/-/es6-promisify-5.0.0.tgz",
       "integrity": "sha1-UQnWLz5W6pZ8S2NQWu8IKRyKUgM=",
-      "dev": true,
       "requires": {
         "es6-promise": "^4.0.3"
       }
@@ -9140,7 +9145,6 @@
       "version": "1.9.1",
       "resolved": "https://registry.npmjs.org/escodegen/-/escodegen-1.9.1.tgz",
       "integrity": "sha512-6hTjO1NAWkHnDk3OqQ4YrCuwwmGHL9S3nPlzBOUG/R44rda3wLNrfvQ5fkSGjyhHFKM7ALPKcKGrwvCLe0lC7Q==",
-      "dev": true,
       "requires": {
         "esprima": "^3.1.3",
         "estraverse": "^4.2.0",
@@ -9152,14 +9156,12 @@
         "esprima": {
           "version": "3.1.3",
           "resolved": "https://registry.npmjs.org/esprima/-/esprima-3.1.3.tgz",
-          "integrity": "sha1-/cpRzuYTOJXjyI1TXOSdv/YqRjM=",
-          "dev": true
+          "integrity": "sha1-/cpRzuYTOJXjyI1TXOSdv/YqRjM="
         },
         "source-map": {
           "version": "0.6.1",
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
           "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
-          "dev": true,
           "optional": true
         }
       }
@@ -9760,7 +9762,7 @@
       }
     },
     "eth-contract-metadata": {
-      "version": "github:MetaMask/eth-contract-metadata#4d855fea9a5c899059134e03986be9d98e844270",
+      "version": "github:MetaMask/eth-contract-metadata#f6201b0c4aca8e98321b9b0b65744bc2fe8e35fa",
       "from": "github:MetaMask/eth-contract-metadata#master"
     },
     "eth-ens-namehash": {
@@ -9812,7 +9814,7 @@
           }
         },
         "ethereumjs-abi": {
-          "version": "git+https://github.com/ethereumjs/ethereumjs-abi.git#2863c40e0982acfc0b7163f0285d4c56427c7799",
+          "version": "git+https://github.com/ethereumjs/ethereumjs-abi.git#d84a96796079c8595a0c78accd1e7709f2277215",
           "from": "git+https://github.com/ethereumjs/ethereumjs-abi.git",
           "requires": {
             "bn.js": "^4.10.0",
@@ -9902,7 +9904,7 @@
           }
         },
         "ethereumjs-abi": {
-          "version": "git+https://github.com/ethereumjs/ethereumjs-abi.git#2863c40e0982acfc0b7163f0285d4c56427c7799",
+          "version": "git+https://github.com/ethereumjs/ethereumjs-abi.git#d84a96796079c8595a0c78accd1e7709f2277215",
           "from": "git+https://github.com/ethereumjs/ethereumjs-abi.git",
           "requires": {
             "bn.js": "^4.10.0",
@@ -9971,7 +9973,7 @@
       "dependencies": {
         "babelify": {
           "version": "7.3.0",
-          "resolved": "https://registry.npmjs.org/babelify/-/babelify-7.3.0.tgz",
+          "resolved": "http://registry.npmjs.org/babelify/-/babelify-7.3.0.tgz",
           "integrity": "sha1-qlau3nBn/XvVSWZu4W3ChQh+iOU=",
           "requires": {
             "babel-core": "^6.0.14",
@@ -10082,7 +10084,7 @@
           }
         },
         "ethereumjs-abi": {
-          "version": "git+https://github.com/ethereumjs/ethereumjs-abi.git#2863c40e0982acfc0b7163f0285d4c56427c7799",
+          "version": "git+https://github.com/ethereumjs/ethereumjs-abi.git#d84a96796079c8595a0c78accd1e7709f2277215",
           "from": "git+https://github.com/ethereumjs/ethereumjs-abi.git",
           "requires": {
             "bn.js": "^4.10.0",
@@ -10190,7 +10192,7 @@
           }
         },
         "ethereumjs-abi": {
-          "version": "git+https://github.com/ethereumjs/ethereumjs-abi.git#2863c40e0982acfc0b7163f0285d4c56427c7799",
+          "version": "git+https://github.com/ethereumjs/ethereumjs-abi.git#d84a96796079c8595a0c78accd1e7709f2277215",
           "from": "git+https://github.com/ethereumjs/ethereumjs-abi.git",
           "requires": {
             "bn.js": "^4.10.0",
@@ -10262,7 +10264,7 @@
           "integrity": "sha1-L9w1dvIykDNYl26znaeDIT/5Uj8="
         },
         "ethereumjs-abi": {
-          "version": "git+https://github.com/ethereumjs/ethereumjs-abi.git#2863c40e0982acfc0b7163f0285d4c56427c7799",
+          "version": "git+https://github.com/ethereumjs/ethereumjs-abi.git#d84a96796079c8595a0c78accd1e7709f2277215",
           "from": "git+https://github.com/ethereumjs/ethereumjs-abi.git",
           "requires": {
             "bn.js": "^4.10.0",
@@ -10485,7 +10487,7 @@
           }
         },
         "ethereumjs-abi": {
-          "version": "git+https://github.com/ethereumjs/ethereumjs-abi.git#2863c40e0982acfc0b7163f0285d4c56427c7799",
+          "version": "git+https://github.com/ethereumjs/ethereumjs-abi.git#d84a96796079c8595a0c78accd1e7709f2277215",
           "from": "git+https://github.com/ethereumjs/ethereumjs-abi.git",
           "requires": {
             "bn.js": "^4.10.0",
@@ -10698,7 +10700,7 @@
           "integrity": "sha1-L9w1dvIykDNYl26znaeDIT/5Uj8="
         },
         "ethereumjs-abi": {
-          "version": "git+https://github.com/ethereumjs/ethereumjs-abi.git#2863c40e0982acfc0b7163f0285d4c56427c7799",
+          "version": "git+https://github.com/ethereumjs/ethereumjs-abi.git#d84a96796079c8595a0c78accd1e7709f2277215",
           "from": "git+https://github.com/ethereumjs/ethereumjs-abi.git",
           "requires": {
             "bn.js": "^4.10.0",
@@ -12098,8 +12100,7 @@
     "file-uri-to-path": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/file-uri-to-path/-/file-uri-to-path-1.0.0.tgz",
-      "integrity": "sha512-0Zt+s3L7Vf1biwWZ29aARiVYLx7iMGnEUl9x33fbB/j3jR81u/O2LbqK+Bm1CDSNDKVtJ/YjwY7TUd5SkeLQLw==",
-      "dev": true
+      "integrity": "sha512-0Zt+s3L7Vf1biwWZ29aARiVYLx7iMGnEUl9x33fbB/j3jR81u/O2LbqK+Bm1CDSNDKVtJ/YjwY7TUd5SkeLQLw=="
     },
     "filename-regex": {
       "version": "2.0.1",
@@ -12737,6 +12738,11 @@
         "samsam": "1.x"
       }
     },
+    "formidable": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/formidable/-/formidable-1.2.1.tgz",
+      "integrity": "sha512-Fs9VRguL0gqGHkXS5GQiMCr1VhZBxz0JnJs4JmMp/2jL18Fmbzvv7vOFRU+U8TBkHEE/CX1qDXzJplVULgsLeg=="
+    },
     "forwarded": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/forwarded/-/forwarded-0.1.2.tgz",
@@ -12909,7 +12915,6 @@
       "version": "0.3.10",
       "resolved": "https://registry.npmjs.org/ftp/-/ftp-0.3.10.tgz",
       "integrity": "sha1-kZfYYa2BQvPmPVqDv+TFn3MwiF0=",
-      "dev": true,
       "requires": {
         "readable-stream": "1.1.x",
         "xregexp": "2.0.0"
@@ -12918,14 +12923,12 @@
         "isarray": {
           "version": "0.0.1",
           "resolved": "https://registry.npmjs.org/isarray/-/isarray-0.0.1.tgz",
-          "integrity": "sha1-ihis/Kmo9Bd+Cav8YDiTmwXR7t8=",
-          "dev": true
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@@ -24430,6 +24433,11 @@
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@@ -31158,11 +31159,49 @@
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-      "integrity": "sha1-M8UDmPcOp+uW0h97gXYwpVeRx+4=",
-      "dev": true
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@@ -31203,8 +31242,7 @@
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-      "integrity": "sha1-8FKijacOYYkX7wqKw0wa5aaChrM=",
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@@ -31224,6 +31262,17 @@
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+      "resolved": "https://registry.npmjs.org/pubnub/-/pubnub-4.21.7.tgz",
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-      "integrity": "sha1-d+5vvvqcDyn6CdTRUggHxqYEK5o="
+    "qrcode-generator": {
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@@ -33816,8 +33865,7 @@
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@@ -34633,7 +34681,6 @@
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@@ -34643,7 +34690,6 @@
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@@ -35986,6 +36032,89 @@
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+        "qs": "^6.5.1",
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+      "resolved": "https://registry.npmjs.org/superagent-proxy/-/superagent-proxy-1.0.3.tgz",
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+      "requires": {
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+        "proxy-agent": "2"
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+          "requires": {
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+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.1.tgz",
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@@ -36536,8 +36665,7 @@
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-      "integrity": "sha1-+qDp0jDFGsyVyhOjYawFyn4EVT0=",
-      "dev": true
+      "integrity": "sha1-+qDp0jDFGsyVyhOjYawFyn4EVT0="
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@@ -36945,7 +37073,6 @@
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@@ -38451,8 +38578,7 @@
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-      "integrity": "sha1-UqY+VsoLhKfzpfPWGHLxJq16WUM=",
-      "dev": true
+      "integrity": "sha1-UqY+VsoLhKfzpfPWGHLxJq16WUM="
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@@ -38467,8 +38593,7 @@
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-      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
-      "dev": true
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diff --git a/package.json b/package.json
index f5600d019..bd3a190e3 100644
--- a/package.json
+++ b/package.json
@@ -173,9 +173,10 @@
     "promise-filter": "^1.1.0",
     "promise-to-callback": "^1.0.0",
     "prop-types": "^15.6.1",
+    "pubnub": "^4.21.5",
     "pump": "^3.0.0",
     "pumpify": "^1.3.4",
-    "qrcode-npm": "0.0.3",
+    "qrcode-generator": "1.4.1",
     "ramda": "^0.24.1",
     "react": "^15.6.2",
     "react-addons-css-transition-group": "^15.6.0",
diff --git a/ui/app/actions.js b/ui/app/actions.js
index f3e9d2b27..a9c3d2ccf 100644
--- a/ui/app/actions.js
+++ b/ui/app/actions.js
@@ -63,6 +63,7 @@ var actions = {
   CREATE_NEW_VAULT_IN_PROGRESS: 'CREATE_NEW_VAULT_IN_PROGRESS',
   SHOW_CREATE_VAULT: 'SHOW_CREATE_VAULT',
   SHOW_RESTORE_VAULT: 'SHOW_RESTORE_VAULT',
+  fetchInfoToSync,
   FORGOT_PASSWORD: 'FORGOT_PASSWORD',
   forgotPassword: forgotPassword,
   markPasswordForgotten,
@@ -635,6 +636,21 @@ function requestRevealSeedWords (password) {
   }
 }
 
+function fetchInfoToSync () {
+  return dispatch => {
+    log.debug(`background.fetchInfoToSync`)
+    return new Promise((resolve, reject) => {
+      background.fetchInfoToSync((err, result) => {
+        if (err) {
+          dispatch(actions.displayWarning(err.message))
+          return reject(err)
+        }
+        resolve(result)
+      })
+    })
+  }
+}
+
 function resetAccount () {
   return dispatch => {
     dispatch(actions.showLoadingIndication())
diff --git a/ui/app/app.js b/ui/app/app.js
index 9c44bd553..1001adc9a 100644
--- a/ui/app/app.js
+++ b/ui/app/app.js
@@ -25,6 +25,7 @@ import Lock from './components/pages/lock'
 import UiMigrationAnnouncement from './components/ui-migration-annoucement'
 const RestoreVaultPage = require('./components/pages/keychains/restore-vault').default
 const RevealSeedConfirmation = require('./components/pages/keychains/reveal-seed')
+const MobileSyncPage = require('./components/pages/mobile-sync')
 const AddTokenPage = require('./components/pages/add-token')
 const ConfirmAddTokenPage = require('./components/pages/confirm-add-token')
 const ConfirmAddSuggestedTokenPage = require('./components/pages/confirm-add-suggested-token')
@@ -55,6 +56,7 @@ import {
   UNLOCK_ROUTE,
   SETTINGS_ROUTE,
   REVEAL_SEED_ROUTE,
+  MOBILE_SYNC_ROUTE,
   RESTORE_VAULT_ROUTE,
   ADD_TOKEN_ROUTE,
   CONFIRM_ADD_TOKEN_ROUTE,
@@ -90,6 +92,7 @@ class App extends Component {
         <Initialized path={UNLOCK_ROUTE} component={UnlockPage} exact />
         <Initialized path={RESTORE_VAULT_ROUTE} component={RestoreVaultPage} exact />
         <Authenticated path={REVEAL_SEED_ROUTE} component={RevealSeedConfirmation} exact />
+        <Authenticated path={MOBILE_SYNC_ROUTE} component={MobileSyncPage} exact />
         <Authenticated path={SETTINGS_ROUTE} component={Settings} />
         <Authenticated path={NOTICE_ROUTE} component={NoticeScreen} exact />
         <Authenticated path={`${CONFIRM_TRANSACTION_ROUTE}/:id?`} component={ConfirmTransaction} />
diff --git a/ui/app/components/pages/mobile-sync/index.js b/ui/app/components/pages/mobile-sync/index.js
new file mode 100644
index 000000000..22a69d092
--- /dev/null
+++ b/ui/app/components/pages/mobile-sync/index.js
@@ -0,0 +1,387 @@
+const { Component } = require('react')
+const { connect } = require('react-redux')
+const PropTypes = require('prop-types')
+const h = require('react-hyperscript')
+const classnames = require('classnames')
+const PubNub = require('pubnub')
+
+const { requestRevealSeedWords, fetchInfoToSync } = require('../../../actions')
+const { DEFAULT_ROUTE } = require('../../../routes')
+const actions = require('../../../actions')
+
+const qrCode = require('qrcode-generator')
+
+import Button from '../../button'
+import LoadingScreen from '../../loading-screen'
+
+const PASSWORD_PROMPT_SCREEN = 'PASSWORD_PROMPT_SCREEN'
+const REVEAL_SEED_SCREEN = 'REVEAL_SEED_SCREEN'
+
+class MobileSyncPage extends Component {
+  static propTypes = {
+    history: PropTypes.object,
+    selectedAddress: PropTypes.string,
+    displayWarning: PropTypes.func,
+    fetchInfoToSync: PropTypes.func,
+    requestRevealSeedWords: PropTypes.func,
+  }
+
+  constructor (props) {
+    super(props)
+
+    this.state = {
+      screen: PASSWORD_PROMPT_SCREEN,
+      password: '',
+      seedWords: null,
+      error: null,
+      syncing: false,
+      completed: false,
+    }
+
+    this.syncing = false
+  }
+
+  componentDidMount () {
+    const passwordBox = document.getElementById('password-box')
+    if (passwordBox) {
+      passwordBox.focus()
+    }
+  }
+
+  handleSubmit (event) {
+    event.preventDefault()
+    this.setState({ seedWords: null, error: null })
+    this.props.requestRevealSeedWords(this.state.password)
+      .then(seedWords => {
+        this.generateCipherKeyAndChannelName()
+        this.setState({ seedWords, screen: REVEAL_SEED_SCREEN })
+        this.initWebsockets()
+      })
+      .catch(error => this.setState({ error: error.message }))
+  }
+
+  generateCipherKeyAndChannelName () {
+    this.cipherKey = `${this.props.selectedAddress.substr(-4)}-${PubNub.generateUUID()}`
+    this.channelName = `mm-${PubNub.generateUUID()}`
+  }
+
+  initWebsockets () {
+    this.pubnub = new PubNub({
+      subscribeKey: process.env.PUBNUB_SUB_KEY,
+      publishKey: process.env.PUBNUB_PUB_KEY,
+      cipherKey: this.cipherKey,
+      ssl: true,
+    })
+
+    this.pubnubListener = this.pubnub.addListener({
+      message: (data) => {
+        const {channel, message} = data
+        // handle message
+        if (channel !== this.channelName || !message) {
+          return false
+        }
+
+        if (message.event === 'start-sync') {
+            this.startSyncing()
+        } else if (message.event === 'end-sync') {
+            this.disconnectWebsockets()
+            this.setState({syncing: false, completed: true})
+        }
+      },
+    })
+
+    this.pubnub.subscribe({
+      channels: [this.channelName],
+      withPresence: false,
+    })
+
+  }
+
+  disconnectWebsockets () {
+    if (this.pubnub && this.pubnubListener) {
+      this.pubnub.disconnect(this.pubnubListener)
+    }
+  }
+
+    // Calculating a PubNub Message Payload Size.
+  calculatePayloadSize (channel, message) {
+    return encodeURIComponent(
+        channel + JSON.stringify(message)
+    ).length + 100
+  }
+
+  chunkString (str, size) {
+    const numChunks = Math.ceil(str.length / size)
+    const chunks = new Array(numChunks)
+    for (let i = 0, o = 0; i < numChunks; ++i, o += size) {
+      chunks[i] = str.substr(o, size)
+    }
+    return chunks
+  }
+
+  notifyError (errorMsg) {
+    return new Promise((resolve, reject) => {
+      this.pubnub.publish(
+        {
+          message: {
+            event: 'error-sync',
+            data: errorMsg,
+          },
+          channel: this.channelName,
+          sendByPost: false, // true to send via post
+          storeInHistory: false,
+      },
+      (status, response) => {
+        if (!status.error) {
+          resolve()
+        } else {
+          reject(response)
+        }
+      })
+    })
+  }
+
+  async startSyncing () {
+    if (this.syncing) return false
+    this.syncing = true
+    this.setState({syncing: true})
+
+    const { accounts, network, preferences, transactions } = await this.props.fetchInfoToSync()
+
+    const allDataStr = JSON.stringify({
+      accounts,
+      network,
+      preferences,
+      transactions,
+      udata: {
+        pwd: this.state.password,
+        seed: this.state.seedWords,
+      },
+    })
+
+    const chunks = this.chunkString(allDataStr, 17000)
+    const totalChunks = chunks.length
+    try {
+      for (let i = 0; i < totalChunks; i++) {
+        await this.sendMessage(chunks[i], i + 1, totalChunks)
+      }
+    } catch (e) {
+      this.props.displayWarning('Sync failed :(')
+      this.setState({syncing: false})
+      this.syncing = false
+      this.notifyError(e.toString())
+    }
+  }
+
+  sendMessage (data, pkg, count) {
+    return new Promise((resolve, reject) => {
+      this.pubnub.publish(
+         {
+            message: {
+              event: 'syncing-data',
+              data,
+              totalPkg: count,
+              currentPkg: pkg,
+            },
+            channel: this.channelName,
+            sendByPost: false, // true to send via post
+            storeInHistory: false,
+        },
+        (status, response) => {
+          if (!status.error) {
+            resolve()
+          } else {
+            reject(response)
+          }
+        }
+      )
+    })
+  }
+
+
+  componentWillUnmount () {
+    this.disconnectWebsockets()
+  }
+
+  renderWarning (text) {
+    return (
+      h('.page-container__warning-container', [
+       h('.page-container__warning-message', [
+          h('div', [text]),
+        ]),
+      ])
+    )
+  }
+
+  renderContent () {
+    const { t } = this.context
+
+    if (this.state.syncing) {
+      return h(LoadingScreen, {loadingMessage: 'Sync in progress'})
+    }
+
+    if (this.state.completed) {
+      return h('div.reveal-seed__content', {},
+          h('label.reveal-seed__label', {
+            style: {
+             width: '100%',
+             textAlign: 'center',
+            },
+          }, t('syncWithMobileComplete')),
+      )
+    }
+
+    return this.state.screen === PASSWORD_PROMPT_SCREEN
+      ? h('div', {}, [
+        this.renderWarning(this.context.t('mobileSyncText')),
+        h('.reveal-seed__content', [
+          this.renderPasswordPromptContent(),
+        ]),
+      ])
+      : h('div', {}, [
+        this.renderWarning(this.context.t('syncWithMobileBeCareful')),
+        h('.reveal-seed__content', [ this.renderRevealSeedContent() ]),
+      ])
+  }
+
+  renderPasswordPromptContent () {
+    const { t } = this.context
+
+    return (
+      h('form', {
+        onSubmit: event => this.handleSubmit(event),
+      }, [
+        h('label.input-label', {
+          htmlFor: 'password-box',
+        }, t('enterPasswordContinue')),
+        h('.input-group', [
+          h('input.form-control', {
+            type: 'password',
+            placeholder: t('password'),
+            id: 'password-box',
+            value: this.state.password,
+            onChange: event => this.setState({ password: event.target.value }),
+            className: classnames({ 'form-control--error': this.state.error }),
+          }),
+        ]),
+        this.state.error && h('.reveal-seed__error', this.state.error),
+      ])
+    )
+  }
+
+  renderRevealSeedContent () {
+
+    const qrImage = qrCode(0, 'M')
+    qrImage.addData(`metamask-sync:${this.channelName}|@|${this.cipherKey}`)
+    qrImage.make()
+
+    const { t } = this.context
+    return (
+      h('div', [
+        h('label.reveal-seed__label', {
+          style: {
+           width: '100%',
+           textAlign: 'center',
+          },
+        }, t('syncWithMobileScanThisCode')),
+        h('.div.qr-wrapper', {
+          style: {
+            display: 'flex',
+            justifyContent: 'center',
+          },
+          dangerouslySetInnerHTML: {
+            __html: qrImage.createTableTag(4),
+          },
+        }),
+      ])
+    )
+  }
+
+  renderFooter () {
+    return this.state.screen === PASSWORD_PROMPT_SCREEN
+      ? this.renderPasswordPromptFooter()
+      : this.renderRevealSeedFooter()
+  }
+
+  renderPasswordPromptFooter () {
+    return (
+      h('div.new-account-import-form__buttons', {style: {padding: 30}}, [
+
+        h(Button, {
+          type: 'default',
+          large: true,
+          className: 'new-account-create-form__button',
+          onClick: () => this.props.history.push(DEFAULT_ROUTE),
+        }, this.context.t('cancel')),
+
+        h(Button, {
+          type: 'primary',
+          large: true,
+          className: 'new-account-create-form__button',
+          onClick: event => this.handleSubmit(event),
+          disabled: this.state.password === '',
+        }, this.context.t('next')),
+      ])
+    )
+  }
+
+  renderRevealSeedFooter () {
+    return (
+      h('.page-container__footer', {style: {padding: 30}}, [
+        h(Button, {
+          type: 'default',
+          large: true,
+          className: 'page-container__footer-button',
+          onClick: () => this.props.history.push(DEFAULT_ROUTE),
+        }, this.context.t('close')),
+      ])
+    )
+  }
+
+  render () {
+    return (
+      h('.page-container', [
+        h('.page-container__header', [
+          h('.page-container__title', this.context.t('syncWithMobileTitle')),
+          this.state.screen === PASSWORD_PROMPT_SCREEN ? h('.page-container__subtitle', this.context.t('syncWithMobileDesc')) : null,
+          this.state.screen === PASSWORD_PROMPT_SCREEN ? h('.page-container__subtitle', this.context.t('syncWithMobileDescNewUsers')) : null,
+        ]),
+        h('.page-container__content', [
+            this.renderContent(),
+        ]),
+        this.renderFooter(),
+      ])
+    )
+  }
+}
+
+MobileSyncPage.propTypes = {
+  requestRevealSeedWords: PropTypes.func,
+  fetchInfoToSync: PropTypes.func,
+  history: PropTypes.object,
+}
+
+MobileSyncPage.contextTypes = {
+  t: PropTypes.func,
+}
+
+const mapDispatchToProps = dispatch => {
+  return {
+    requestRevealSeedWords: password => dispatch(requestRevealSeedWords(password)),
+    fetchInfoToSync: () => dispatch(fetchInfoToSync()),
+    displayWarning: (message) => dispatch(actions.displayWarning(message || null)),
+  }
+
+}
+
+const mapStateToProps = state => {
+  const {
+    metamask: { selectedAddress },
+  } = state
+
+  return {
+    selectedAddress,
+  }
+}
+
+module.exports = connect(mapStateToProps, mapDispatchToProps)(MobileSyncPage)
diff --git a/ui/app/components/pages/settings/settings-tab/settings-tab.component.js b/ui/app/components/pages/settings/settings-tab/settings-tab.component.js
index 1c02b2507..661cbd1dc 100644
--- a/ui/app/components/pages/settings/settings-tab/settings-tab.component.js
+++ b/ui/app/components/pages/settings/settings-tab/settings-tab.component.js
@@ -5,7 +5,7 @@ import validUrl from 'valid-url'
 import { exportAsFile } from '../../../../util'
 import SimpleDropdown from '../../../dropdowns/simple-dropdown'
 import ToggleButton from 'react-toggle-button'
-import { REVEAL_SEED_ROUTE } from '../../../../routes'
+import { REVEAL_SEED_ROUTE, MOBILE_SYNC_ROUTE } from '../../../../routes'
 import locales from '../../../../../../app/_locales/index.json'
 import TextField from '../../../text-field'
 import Button from '../../../button'
@@ -46,6 +46,7 @@ export default class SettingsTab extends PureComponent {
     delRpcTarget: PropTypes.func,
     displayWarning: PropTypes.func,
     revealSeedConfirmation: PropTypes.func,
+    setFeatureFlagToBeta: PropTypes.func,
     showClearApprovalModal: PropTypes.func,
     showResetAccountConfirmationModal: PropTypes.func,
     warning: PropTypes.string,
@@ -61,6 +62,7 @@ export default class SettingsTab extends PureComponent {
     setUseNativeCurrencyAsPrimaryCurrencyPreference: PropTypes.func,
     setAdvancedInlineGasFeatureFlag: PropTypes.func,
     advancedInlineGas: PropTypes.bool,
+    mobileSync: PropTypes.bool,
   }
 
   state = {
@@ -338,6 +340,39 @@ export default class SettingsTab extends PureComponent {
     )
   }
 
+
+  renderMobileSync () {
+    const { t } = this.context
+    const { history, mobileSync } = this.props
+
+    if (!mobileSync) {
+      return
+    }
+
+    return (
+      <div className="settings-page__content-row">
+        <div className="settings-page__content-item">
+          <span>{ t('syncWithMobile') }</span>
+        </div>
+        <div className="settings-page__content-item">
+          <div className="settings-page__content-item-col">
+            <Button
+              type="primary"
+              large
+              onClick={event => {
+                event.preventDefault()
+                history.push(MOBILE_SYNC_ROUTE)
+              }}
+            >
+              { t('syncWithMobile') }
+            </Button>
+          </div>
+        </div>
+      </div>
+    )
+  }
+
+
   renderResetAccount () {
     const { t } = this.context
     const { showResetAccountConfirmationModal } = this.props
@@ -538,6 +573,7 @@ export default class SettingsTab extends PureComponent {
         { this.renderHexDataOptIn() }
         { this.renderAdvancedGasInputInline() }
         { this.renderBlockieOptIn() }
+        { this.renderMobileSync() }
       </div>
     )
   }
diff --git a/ui/app/components/pages/settings/settings-tab/settings-tab.container.js b/ui/app/components/pages/settings/settings-tab/settings-tab.container.js
index 49da0db12..72458ba33 100644
--- a/ui/app/components/pages/settings/settings-tab/settings-tab.container.js
+++ b/ui/app/components/pages/settings/settings-tab/settings-tab.container.js
@@ -26,6 +26,7 @@ const mapStateToProps = state => {
       sendHexData,
       privacyMode,
       advancedInlineGas,
+      mobileSync,
     } = {},
     provider = {},
     currentLocale,
@@ -44,6 +45,7 @@ const mapStateToProps = state => {
     privacyMode,
     provider,
     useNativeCurrencyAsPrimaryCurrency,
+    mobileSync,
   }
 }
 
diff --git a/ui/app/components/qr-code.js b/ui/app/components/qr-code.js
index 1c07e244c..312815891 100644
--- a/ui/app/components/qr-code.js
+++ b/ui/app/components/qr-code.js
@@ -1,6 +1,6 @@
 const Component = require('react').Component
 const h = require('react-hyperscript')
-const qrCode = require('qrcode-npm').qrcode
+const qrCode = require('qrcode-generator')
 const inherits = require('util').inherits
 const connect = require('react-redux').connect
 const { isHexPrefixed } = require('ethereumjs-util')
diff --git a/ui/app/components/shapeshift-form.js b/ui/app/components/shapeshift-form.js
index a842bcc8b..b22c01e8f 100644
--- a/ui/app/components/shapeshift-form.js
+++ b/ui/app/components/shapeshift-form.js
@@ -4,7 +4,7 @@ const PropTypes = require('prop-types')
 const Component = require('react').Component
 const connect = require('react-redux').connect
 const classnames = require('classnames')
-const { qrcode } = require('qrcode-npm')
+const qrcode = require('qrcode-generator')
 const { shapeShiftSubview, pairUpdate, buyWithShapeShift } = require('../actions')
 const { isValidAddress } = require('../util')
 const SimpleDropdown = require('./dropdowns/simple-dropdown')
diff --git a/ui/app/routes.js b/ui/app/routes.js
index fcf3d3e68..2f4863547 100644
--- a/ui/app/routes.js
+++ b/ui/app/routes.js
@@ -4,6 +4,7 @@ const LOCK_ROUTE = '/lock'
 const SETTINGS_ROUTE = '/settings'
 const INFO_ROUTE = '/settings/info'
 const REVEAL_SEED_ROUTE = '/seed'
+const MOBILE_SYNC_ROUTE = '/mobile-sync'
 const CONFIRM_SEED_ROUTE = '/confirm-seed'
 const RESTORE_VAULT_ROUTE = '/restore-vault'
 const ADD_TOKEN_ROUTE = '/add-token'
@@ -43,6 +44,7 @@ module.exports = {
   SETTINGS_ROUTE,
   INFO_ROUTE,
   REVEAL_SEED_ROUTE,
+  MOBILE_SYNC_ROUTE,
   CONFIRM_SEED_ROUTE,
   RESTORE_VAULT_ROUTE,
   ADD_TOKEN_ROUTE,