Useful Mobile Codes

If you are a GSM mobile User then here are certain useful codes which may be helpful to you in few ways. Well few say that these are secret codes and all stuff but to be frank these are not any secret codes or anything these are codes officially provided by the Network Operators. So these are not any tricks or secret codes these are useful codes provided by the Operator to control certain call facilities, incoming calls, etc. .  

 Check out the Follow Codes :-

Call waiting

1. Activate call waiting *43*#
2. Deactivate call waiting #43##
3. Check status of call waiting *#43#

CLIR: Presentation of one's own number to the to the called party.

1. Activate CLIR **31#
2. Activate CLIR for the actual call *31#number
3. Deactivate CLIR ##31#
4. Deactivate CLIR for the actual call #31#number
5. 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#

Note :- 
** Register and Activate
* Activate
## De-Register or Deactivate)
# Deactivate
*# Check Status.