Secret Codes in Mobile Phones

To check the IMEI (International Mobile Equipment Identity) Type-
*#06#
Information you get from the IMEI-
XXXXXX  XX  XXXXXX  X
TAC      FAC     SNR      SP
TAC = Type approval code
FAC = Final assembly code
SNR = Serial number

 SP    = Spare

(=> means press joystick, arrow keys or jogdial to the right and <= means left.)

Sony Ericsson
Secret Menu : You'll see phone model, software info, IMEI, configuration info, sim lock status, REAL time clock, total call time and text labels. You can also test your phones services and hardware from this menu (main display, camera, LED/illumination, Flash LED, keyboard, earphone, speaker, microphone, radio and vibrator tests)	=> * <= <= * <= *
IMEI Number	*#06#
Lockstatus	<= * * <=
Last dialed numbers	0#
Shortcut SIM numbers	Type a number and press #
To reset to default language	<= 0000 =>

Samsung
Software version	*#9999#
IMEI number	*#06#
Serial number	*#0001#
Battery status- Memory capacity	*#9998*246#
Debug screen	*#9998*324# – *#8999*324#
LCD contrast	*#9998*523#
Vibration test	*#9998*842# – *#8999*842#
Alarm beeper – Ringtone test	*#9998*289# – *#8999*289#
Smiley	*#9125#
Software version	*#0837#
Display contrast	*#0523# – *#8999*523#
Battery info	*#0228# or *#8999*228#
Display storage capacity	*#8999*636#
Display SIM card information	*#8999*778#
Show date and alarm clock	*#8999*782#
The display during warning	*#8999*786#
Samsung hardware version	*#8999*837#
Show network information	*#8999*638#
Display received channel number and received intensity: *#8999*9266# *#1111# S/W Version *#1234# Firmware Version *#2222# H/W Version *#8999*8376263# All Versions Together *#8999*8378# Test Menu *#4777*8665# GPSR Tool *#8999*523# LCD Brightness *#8999*377# Error LOG Menu *#8999*327# EEP Menu *#8999*667# Debug Mode *#92782# PhoneModel (Wap) #*5737425# JAVA Mode *#2255# Call List *#232337# Bluetooth MAC Adress *#5282837# Java Version Type in *#0000# on a Samsung A300 to reset the language Master reset(unlock) #*7337# (for the new samsung E700 x600 but not E710) Samsung E700 type *#2255# to show secret call log (not tested) Samsung A300, A800 phone unlock enter this *2767*637# Samsung V200, S100, S300 phone unlock : *2767*782257378#

Nokia
To check the phones Software revision type	*#0000#
service menu	*#92702689# (*#WAR0ANTY#)
To check whether your SIM Card supports clock stopping type	*#746025625# (*#SIM0CLOCK#)
To activate EFR (Enhanced Full Rate) Enter the code (Call Quality)	*3370# (This improves call quality but decreases batterylife by about 5%) To deactivate it, Enter the code #3370#

Read more: http://www.livetolearn.in/site/blog/secret-codes-mobile-phones#ixzz1uoz8hq2B