I just upgraded from a Samsung Galaxy S2 to the Nexus 5. S2 used to have these USSD dialer codes through which you would check various functionalities of the phone (like *#06# Shows IMEI and *#0*# used to give options to test LCD, Speaker, Camera etc). I am looking for such codes for the Nexus 5. Apart from IMEI the other codes doesn't work. Can someone help please?