P.S: Not all these Android secret codes codes
work for all the phone models mentioned above.
Some work for Samsung, some forSony and Some
for HTC.Hardware/Software/Network*#*0*#–
general test*#*#0*#*#*– LCD
test*#*#0283#*#*– Packet
Loopbacktest*#*#0289#*#* – Audio
test*#*#0588#*#*– Proximity sensor test*#06#–
Display IMEI number*#*#0673#*#*– Audio
test*#07#– Test History*#*#0842#*#*–
Vibration test and Backlight test*#*#1234#*#*–
Display current firmware*#*#232338#*#*–
Shows Wifi MAC address*#*#232339#*#*- Wifi
Test*#*#273283*255*663282*#*#*– For a quick
Backup of all Media Files*2767*4387264636#–
To display product code*#*#3264#*#*– RAM
version*#*#34971539#*#*– Show complete
information about camera*#*#44336#*#*– PDA,
Phone, CSC, Build Time, Change list
number*#*#4986*2650468#*#*– PDA, Phone, H/
W, RF Call Date*#*#526#*#*–