Hidden Android Secret Codes that you must know

*#*#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 Test
*#*#3264#*#* = Rom version
*#*#23233I#‘*#* = bluetooth Test
*#*# 1234#’#’ = PDA and Phone Firmware Info
*#*#0*#*#*= LCD Display Test
*#*#0842#*#* Vibration and Backlight Test
*#*#0588#*#* = Proximity Sensor Test
*#*#232338#*#* = Wi-Fi Mac Address
*#*#7262626#*#*= Field Test
*#*#34971539#*#* = Camera Update
*#*#19732840#*#* = Enable Test Mode