The Useful key needed in Android.

The Important keys in Android phones. Hidden Secret Android Codes *#*#778O#*#* = Factory Data Reset... *#*#I472365#*#* = Quick GPS Test... *#*#0673#*#* OR *#*#0289#*#* = Audio Test... *#*#2664#*#* = Touch Screen Test #’#273283*255*663282*#*#* = Backup Media Files... *#*#0283#*#* = Packet Loopback...

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