SECRET CODE OF CHINA MOBILE

*#66*# Set Factory Mode CONFIRMED

*#8375# Show Software Version CONFIRMED

*#1234# A2DP ACP Mode CONFIRMED

*#1234# A2DP INT Mode CONFIRMED

SECRET CODE OF SHARP MOBILE

Sharp Secret Codes

*01763*8371# (*01763*VER0#) --- Firmware Version.
*01763*3641# (*01763*ENG1#) --- Enable Engineer Mode hold pwr key to leave then disable.

SECRET CODE OF SAGEM MOBILE

Sagem Secret Codes

Press menu then * for secret menu
IMEI number:
511,#

SECRET CODE OF BENQ-SIEMENS MOBILE

BenQ-Siemens Secret Codes

Software version:
*#06#
to see more info, press softkey again
English menu:
*#0001#

SECRET CODE OF LG MOBILE

LG Secret Codes

LG all models test mode: Type 2945#*# on the main screen.
2945*#01*# Secret menu for LG

SECRET CODE OF SONY ERICSON

Sony Ericsson Secret Codes

Sony Ericsson Secret Menu: -> * <- <- * <- *
(-> means press joystick, arrow keys or jogdial to the right and <- means left.)
You'll see phone model, software info, IMEI, configuration info, sim lock status, REAL time clock, total call time and text labels.

SECRET CODE OF MOTOROLA MOBILE

Motorola Secret Codes

IMEI number:
*#06#
Code to lock keys. Press together *7
Note: [] (pause) means the * key held in until box appears.

SECRET CODE OF SAMSUNG MOBILE

Samsung Secret Codes

Software version: *#9999#
IMEI number: *#06#
Serial number: *#0001#
Battery status- Memory capacity : *#9998*246#
Debug screen: *#9998*324# - *#8999*324#
LCD kontrast: *#9998*523#

SECRET CODE OF NOKIA MOBILE

Nokia Secret Codes

On the main screen type
*#06# for checking the IMEI (International Mobile Equipment Identity).
*#7780# reset to factory settings.
*#67705646# This will clear the LCD display(operator logo).
*#0000# To view software version.
*#2820# Bluetooth device address.
*#746025625# Sim clock allowed status. 
*#62209526# - Display the MAC address of the WLAN adapter. This is available only in the newer devices that supports WLAN like N80
#pw+1234567890+1# Shows if sim have restrictions.