Generic GSM, including AT&T USA (built in codes in "Call forward" iphone app):
| Forward service | Activate | Cancel & Deregister | Cancel & Retain | Status | Reestablish |
|---|---|---|---|---|---|
| Unconditional forwarding: | |||||
| all calls | *21*[phone number]# | ##21# | #21# | *#21# | *21# |
| Conditional forwarding: | |||||
| if busy | *67*[phone number]# | ##67# | #67# | *#67# | *67# |
| if not answered | *61*[phone number]# | ##61# | #61# | *#61# | *61# |
| if out of reach | *62*[phone number]# | ##62# | #62# | *#62# | *62# |
| all forwards | *002*[phone number]# | ##002# | #002# | *#002# | *002# |
| all conditional forwards | *004*[phone number]# | ##004# | #004# | *#004# | *004# |
------------------------------------------------------------------------------------------------------------------------
Verizon USA:
Activate: *72[phone number]
Deactivate:*720[phone number]
Conditional activate: *71[phone number]
According to forums, sometimes forwarding at verizon is not working.
------------------------------------------------------------------------------------------------------------------------
The Sprint Nextel cellphone company uses these:
| Forward service | Activation | Deactivation |
|---|---|---|
| On busy or no answer | *28[phone number] | *38 |
| On busy | *74[phone number] | *740 |
| On no answer | *73[phone number] | *730 |
| Immediately | *72[phone number] | *720 |
------------------------------------------------------------------------------------------------------------------------
Canada, Rogers: YOU HAVE TO BUY THE SERVICE FROM ROGERS FIRST!
(source: http://voicesync.ca/?p=78)
To activate: * 67 * [area code and phone number] # SEND
To cancel: ## 67 # SEND
To reactivate: * 67 * SEND
Status: * # 67 # SEND
To activate: * 21 * [area code and phone number] # SEND
To cancel: ## 21 # SEND
To reactivate: * 21 * SEND
Status: * # 21 # SEND
Busy/ No Answer Transfer (includes busy, no reply & out of reach
To activate: * 004 * [area code and phone number] # SEND
To cancel: ## 004 # SEND
To reactivate: * 004 # SEND
Status: * # 004 # SEND
Busy Transfer
To activate: * 61 * [area code and phone number] # SEND
To cancel: ## 61 # SEND
To reactivate: * 61 * SEND
Status: * # 61 # SEND
Use case: Why to pay for voice mail for both wireless and home service. VoiceSync will consolidate all your voicemails. Wireless voice mail is $7/month where as call forwarding is $3/month.
-------------------------------------------------------------------------
Comments
All calls
To activate
Press: **21* number # OK.
To cancel
Press: ##21# OK.
Forwarded when busy
To activate
Press: **67* number # OK.
To cancel
Press: ##67# OK.
Forwarded when out of network range or switched off
To activate
Press: **62* number # OK.
To cancel
Press: ##62# OK.
Forwarded when after a few rings there is no response
To activate
Press: **61* number # OK.
To cancel
Press: ##61# OK
To deactivate all calls forwarding
Press: ##002# OK.
Example: to forward your calls to 5828100
Press: **62*065828100# OK.