http://en.wikipedia.org/wiki/Call_forwarding
For GSM/3GSM (UMTS) phones, the GSM standard defines the following forwarding codes. These were developed by ETSI and are based on standard European diversion codes and are similar to those used on most landlines in the EU:[4]
| 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# |
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