The GSM standard allows most of the functions to be controlled by entering codes into the keypad of a mobile phone: you can set diverts and the like, accept or reject calls, or even change your PIN code by typing at the keypad. Unfortunately, not all the codes listed here are enabled by every network. If a code isn't supported, it simply won't work: you won't break anything by trying to use it!
Call Divert (all call types)
All
Set: **21*destination#[SEND]
Cancel: ##21#[SEND]
Query: *#21#[SEND]
No Answer
Delay nn seconds: max 30 seconds, in 5 second increments
Set: **61*destination*nn#[SEND]
Cancel: ##61#[SEND]
Query: *#61#[SEND]
Unreachable
Set: **62*destination#[SEND]
Cancel: #62#[SEND]
Query: *#62#[SEND]
Busy
Set: **67*destination#[SEND]
Cancel: ##67#[SEND]
Query: *#67#[SEND]
Cancel All
##002#[SEND]
Divert Voice Calls
All
Set: **21*destination*11#[SEND]
Cancel: ##21*11#[SEND]
Query: *#21*11#[SEND]
No Answer
Delay nn seconds: max 30 seconds, in 5 second increments
Set: **61*destination*11*nn#[SEND]
Cancel: ##61*11#[SEND]
Query: *#61*11#[SEND]
Unreachable
Set: **62*destination*11#[SEND]
Cancel: ##62*11#[SEND]
Query: *#62*11#[SEND]
Busy
Set: **67*destination*11#[SEND]
Cancel: ##67*11#[SEND]
Query: *#67*11#[SEND]
Divert Data Calls
All
Set: **21*destination*25#[SEND]
Cancel: ##21*25 [SEND]
Query: *#21*25#[SEND]
No Answer
Delay nn seconds: max 30 seconds, in 5 second increments
Set: **61*destination*25*nn#[SEND]
Cancel: ##61*25#[SEND]
Query: *#61*25#[SEND]
Unreachable
Set: **62*destination*25#[SEND]
Cancel: ##62*25#[SEND]
Query: *#62*25#[SEND]
Busy
Set: **67*destination*25#[SEND]
Cancel: ##67*25#[SEND]
Query: *#67*25#[SEND]
Divert Fax Calls
All
Set: **21*destination*13#[SEND]
Cancel: ##21*13#[SEND]
Query: *#21*13#[SEND]
No Answer
Delay nn seconds: max 30 seconds, in 5 second increments
Set: **61*destination*13*nn#[SEND]
Cancel: #61*13#[SEND]
Query: *#61*13#[SEND]
Unreachable
Set: **62*destination*13#[SEND]
Cancel: #62*13#[SEND]
Query: *#62*13#[SEND]
Busy
Set: **67*destination*13#[SEND]
Cancel: ##67*13#[SEND]
Query: *#67*13#[SEND]
Divert Line 2 Calls
All
Set: **21*destination*89#[SEND]
Cancel: #21*89#[SEND]
Query: *#21*89#[SEND]
No Answer
Delay nn seconds: max 30 seconds, in 5 second increments
Set: **61*destination*89*nn#[SEND]
Cancel: ##61*89#[SEND]
Query: *#61*89#[SEND]
Unreachable
Set: **62*destination*89#[SEND]
Cancel: ##62*89#[SEND]
Query: *#62*89#[SEND]
Busy
Set: **67*destination*89#[SEND]
Cancel: ##67*89#[SEND]
Query: *#67*89#[SEND]
Call Barring
You use call barring to control what calls can be made or received by your account.
The barring code is specific to the network. Ask your service provider.
Note that Call Barring can't work if call diverts are active, even the autodivert set by the network.
All calls
Set: **33*barring code#[SEND]
Cancel: ##33*barring code#[SEND]
Query: *#33#[SEND]
Outgoing calls
Set: **33*barring code#[SEND]
Cancel: ##33*barring code#[SEND]
Query: *#33#[SEND]
Incoming calls
Set: **35*barring code#[SEND]
Cancel: ##35*barring code#[SEND]
Query: *#35#[SEND]
Outgoing international calls
Set: **331*barring code#[SEND]
Cancel: ##331*barring code#[SEND]
Query: *#331#[SEND]
Outgoing international calls except to home country
Set: **332*barring code#[SEND]
Cancel: ##332*barring code#[SEND]
Query: *#332#[SEND]
Incoming calls when outside home country
Set: *351*barring code#[SEND]
Cancel: #351*barring code#[SEND]
Query: *#351#[SEND]
Cancel All Call Barring
#330*barring code#[SEND] SMS
There is no provision in the GSM specification for diverting SMS messages
Bar incoming SMS messages
Set: *35*barring code*16#[SEND]
Cancel: #35*barring code*16#[SEND]
Call waiting
Set: *43#[SEND]
Cancel: #43#[SEND]
Query: *#43#[SEND]
Incoming call waiting
Reject: 0 [SEND]
Drop current call and answer: 1 [SEND]
Hold current call and answer: 2 [SEND]
Calling line identity
Outgoing CLI Release (recipient sees your number)
Release: *31# destination [SEND]
Withhold: #31# destination [SEND]
Query default: *#31#[SEND]
Incoming CLI Presentation (you see the caller's number)
Allow: *30#[SEND]
Prevent: #30#[SEND]
Query default: *#30#[SEND]
Change PIN codes
Change Call Barring pin code
**03*oldpin*newpin*newpin#
Change SIM pin code
**04*oldpin*newpin*newpin#
Change SIM pin2 code
**042*oldpin*newpin*newpin#
Unblock SIM pin code
**05*PUK*newpin*newpin#
Unblock SIM pin code
**06*PUK2*newpin*newpin#
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