Do you want to know what version of SW do you have in your phone? IMEI number? Below we have listed some secret codes for your mobile phone. With these codes, you can check the phone's IMEI, software version, reset to default language or even deactivate the simlock (but only in some models).

Some of codes listed below must by typed without the SIM card inserted in the mobile, and some with SIM card in the phone. Please be careful with some codes as you may permanently block your mobile phone if you do not follow instructions exactly.

Mobile Telephone Engineer Codes

Philips
IMEI number: * # 0 6 #
Simlock info: * # 8 3 7 7 #
Security code: * # 1 2 3 4 # (Fizz) or * # 7 4 8 9 #

Samsung (Most models)
IMEI number: * # 0 6 #
Software version: * # 9 9 9 9 #
Albo* # 0 8 3 7 #
Net Monitor: * # 0 3 2 4 #
Changing LCD contrast: * # 0 5 2 3 #
Memory info: * # 0 3 7 7 #
Albo * # 0 2 4 6 #
Reset CUSTOM memory: * 2 7 6 7 * 2 8 7 8 #
Battery state: * # 9 9 9 8 * 2 2 8 #
Alarm beeper: * # 9 9 9 8 * 2 8 9 #
Vibra test: * # 9 9 9 8 * 8 4 2 #

Samsung (T100 Specific Codes)
Battery status (capacity, voltage, temperature): * # 8 9 9 9 * 2 2 8 #
Program status: * # 8 9 9 9 * 2 4 6 #
Change Alarm Buzzer Frequency: * # 8 9 9 9 * 2 8 9 #
Debug screens: * # 8 9 9 9 * 3 2 4 #
Watchdog: * # 8 9 9 9 * 3 6 4 #
EEPROM Error Stack: * # 8 9 9 9 * 3 7 7 #
Trace Watchdog: * # 8 9 9 9 * 4 2 7 #
Change LCD contrast: * # 8 9 9 9 * 5 2 3 #
Jig detect: * # 8 9 9 9 * 5 4 4 #
Memory status: * # 8 9 9 9 * 6 3 6 #
SIM File Size: * # 8 9 9 9 * 7 4 6 #
SIM Service Table: * # 8 9 9 9 * 7 7 8 #
RTK (Run Time Kernel) errors: * # 8 9 9 9 * 7 8 5 #
Run, Last UP, Last DOWN: * # 8 9 9 9 * 7 8 6 #
Software Version: * # 8 9 9 9 * 8 3 7 #
Test Vibrator: * # 8 9 9 9 * 8 4 2 #
Vocoder Reg: * # 8 9 9 9 * 8 6 2 #
Diag: * # 8 9 9 9 * 8 7 2 #
Reset On Fatal Error: * # 8 9 9 9 * 9 4 7 #
Last/Chk: * # 8 9 9 9 * 9 9 9 #9 9 * 9 9 9 #

Sagem
IMEI number: * # 0 6 #
Service Menu access: MENU 5 1 1 #

Siemens
IMEI number: * # 0 6 #
Software version: Take out SIM & enter: * # 0 6 # (& press LONG KEY)
Bonus screen: in phone book: + 1 2 0 2 2 2 4 3 1 2 1
Net Monitor (S4 Power):
Menu 9 8, left SoftKey, 7 6 8 4 6 6 6, Read phone, Menu 5 6

Sony
IMEI number: * # 0 6 #
Software version: * # 8 3 7 7 4 6 6 #
Show list of product creator names: + 1 2 0 2 2 2 4 3 1 2 1

SonyEricsson
IMEI number: * # 0 6 #
Software version: > * < < * < *
Default Language: < 0 0 0 0 >
Enter to phone menu without SimCard - after Wrong PIN: press NO: * * 0 4 * 0 0 0 0 * 0 0 0 0 * 0 0 0 0 #
Information about SIMLOCK: < * * < .


Find out more…
    •  Digital Evidence from Mobile Devices – MS PowerPoint presentation
    •  GSM Technical Specification & Tutorial
    •  History & Evolution of Mobile Telephone Communications
    •  GSM Security & Privacy Controls