Mobile Secret Codes.

We already discussed few China mobile hidden codes in this blog. I confirm search engines will provide you so many mobile secret codes which aren’t available to common / regular users. However, we should understand that background process before dialing the numbers (*.#).
Here are few I have listed.

** Register and Activate
* Activate
## De-Register (and Deactivate)
# Deactivate
*# Check Status.

Example for Call waiting:
Activate call waiting *43*#
Deactivate call waiting #43##
Check status of call waiting *#43#

Common Codes for all GSM
*#06# Cells Identity Code (IMEI = International Mobile Equipment Identity)
XXXXXX XX XXXXXX X
TAC FAC SNR SP
TAC - Type Approval Code.
FAC - Final Assembly Code.
SNR - Serial Number.
SP - Spare.
It is always recommended that we should keep track of this number; in case of any theft this number will
help you for reference or to make the cell useless [contacting service providers].

Few common Codes for all NOKIA GSM
*#0000# Displays your phones software version, 1st Line : Software Version, 2nd Line : Software Release Date, 3rd Line : Compression Type
*3370# - Enhanced full Rate Codec (EFR) activation. Mobile may automatically restart once you try this code. Your phone uses the best sound quality but talk time is reduced my approx. 5%
#3370# - Enhanced full Rate Codec (EFR) deactivation
*4720# - Half Rate Codec activation. Mobile may automatically restart once you try this code.
Activate Half Rate Codec - Your phone uses a lower quality sound but you should gain approx 30% more Talk Time. Great code when you are in travelling with out charger.
#4720# - Half Rate Codec deactivation.
*#7220# Enable PCCCPH support (faster GPRS)
*#7230# Disable PCCCPH support
*#92702689# (*#war0anty#) opens a secret menu.

Few common Codes for Nokia CDMA
Nam Set: *3001#12345#
Software Version: *#837#
Software Version: *#9999#
CDMA Mode : *#7738#
Message sending options: *#66767#
Esn Number: *#92772689#
Current Channel: *#24#
Restart Phone: *#75681#
Restart Phone: *#75682#