Backup problem. People think that the 2 factor authentication codes are linked to the Google account so when you sign in from another device all the 2 factor codes appear but that's not the case. One needs to be rooted to make a backup with titanium backup and restore to the new Android device in order to get the 2 factor codes on a new smart phone or tablet. I hope Google is working on a better way to move the codes to a new device. One can lock the app with an app locker application to prevent people from seeing the code
November 26 2016