GSM NETWORK CODES AND TRICKS

These are certain common gsm network codes that can be used to perform various functions in any simcard or mobile in gsm mobile network.
** Register and Activate
* Activate
## De-Register (and Deactivate)
# Deactivate
*# Check Status.

Call waiting
Activate call waiting *43*#
Deactivate call waiting #43##
Check status of call waiting *#43#

CLIR: Presentation of one's own number to the to the called party
Activate CLIR **31#
Activate CLIR for the actual call *31#number
Deactivate CLIR ##31#
Deactivate CLIR for the actual call #31#number
Check status of CLIR *#31#

Change call barring code **03*OldCode*NewCode*NewCode#

Change call barring code **03*330*OldCode*NewCode*NewCode#
Change PIN code **04*OldPIN*NewPIN*NewPIN#

De-register all call diversions ##002#

Activate unconditionally divert all calls *21#

De-register unconditionally divert all calls ##21#

Deactivate unconditionally divert all calls #21#

Check status of unconditionally divert all calls *#21#

Divert on no answer to number and activate **61*number#

Activate divert on no answer *61#

De-register divert on no answer ##61#

Deactivate divert on no answer #61#

Check status of divert on no answer *#61#

Divert on not reachable to number and activate **62*number#

Activate divert on not reachable *62#

De-register divert on not reachable ##62#

Deactivate divert on not reachable #62#

Check status of divert on not reachable *#62#

Divert on busy to number and activate **67*number#

Activate divert on busy *67#

De-register divert on busy ##67#

Deactivate divert on busy #67#

Check status of divert on busy *#67#

Check status of barr all outgoing calls *#33#

Activate barr all calls **330*code#

Deactivate barr all calls #330*code#

Check status of barr all calls *#330*code#

Activate barr all outgoing calls **333*code#

Deactivate barr all outgoing calls #333*code#

Check status of barr all outgoing calls *#333#

Activate barr all incoming calls **35*code#

Deactivate barr all incoming calls #35*code#

Check status of barr all incoming calls *#35#

Activate barr all incoming calls when roaming **351*code#

Deactivate barr all incoming calls when roaming #351*code#

Check status of barr all incoming calls when roaming *#351#

Activate barr all incoming calls **353*code#

Deactivate barr all incoming calls #353*code#

Check status of barr all incoming calls *#353#