This is the most straightforward code. Like the iPhone’s secret mode, it brings up a range of hidden information about your phone and its battery.
Keying it in will give some combination of information about the phone, the battery’s usage, and the network that it’s connected to.
Each phone might show up different information, so if you do this then it’s worth clicking through to see what’s available. FOR ADDING OR REMOVING/ BYPASSING GOOGLE VERIFICATION SETUP Here is how it works. After dailing the above code,(If phone is already on Google verification screen, you need to call your number with another phone, as it is ringing, click on add call, and Dail the code) list of menu will pop up, click on "usage statistics" then hit the "back" ? icon on the top left corner of your phone. this will take you to "settings" you can now edit or add email address to your account to enable you use your phone again. NOTE: it works for phones with high version like 7.0, in case you want to factory reset, check if phone is on FRP before using factory reset. remove all FRP link to google account before resetting.. just try it on your phone and see.