Provide helpful information in the email template

Trust/Extensions/Bundle.swift

@@ -13,6 +13,12 @@ extension Bundle {
     var buildNumberInt: Int {
         return Int(Bundle.main.buildNumber ?? "-1") ?? -1
     }
+
+    var fullVersion: String {
+        let versionNumber = Bundle.main.versionNumber ?? ""
+        let buildNumber = Bundle.main.buildNumber ?? ""
+        return "\(versionNumber) (\(buildNumber))"
+    }
 }
 
 var isDebug: Bool {

Trust/Settings/ViewControllers/SettingsViewController.swift

@@ -228,7 +228,7 @@ class SettingsViewController: FormViewController {
 
             <<< TextRow { [weak self] in
                 $0.title = NSLocalizedString("settings.version.label.title", value: "Version", comment: "")
-                $0.value = self?.version()
+                $0.value = Bundle.main.fullVersion
                 $0.disabled = true
             }
     }
@@ -242,12 +242,6 @@ class SettingsViewController: FormViewController {
         }
     }
 
-    private func version() -> String {
-        let versionNumber = Bundle.main.versionNumber ?? ""
-        let buildNumber = Bundle.main.buildNumber ?? ""
-        return "\(versionNumber) (\(buildNumber))"
-    }
-
     private func linkProvider(
         type: URLServiceProvider
     ) -> ButtonRow {
@@ -289,13 +283,24 @@ class SettingsViewController: FormViewController {
         composerController.mailComposeDelegate = self
         composerController.setToRecipients([Constants.supportEmail])
         composerController.setSubject(NSLocalizedString("settings.feedback.email.title", value: "Trust Feedback", comment: ""))
-        composerController.setMessageBody("", isHTML: false)
+        composerController.setMessageBody(emailTemplate(), isHTML: false)
 
         if MFMailComposeViewController.canSendMail() {
             present(composerController, animated: true, completion: nil)
         }
     }
 
+    private func emailTemplate() -> String {
+        return """
+        \n\n\n
+
+        Helpful information to developers:
+        iOS Version: \(UIDevice.current.systemVersion)
+        Device Model: \(UIDevice.current.model)
+        Trust Version: \(Bundle.main.fullVersion)
+        """
+    }
+
     required init?(coder aDecoder: NSCoder) {
         fatalError("init(coder:) has not been implemented")
     }