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Phone Tips and info
Call Forwarding Commands
Since the iPhone has very basic call forwarding options, here are manual settings you can store in your addressbook.
I suggest you always include the country code "+41" (that's the country code for Switzerland) in any call forwarding commands to ensure that these work when roaming on a foreign network provider.
Call Forward to any number (if not answered)
**61*+nnnnnnnnnnnn# (replace "n" with your country code, area code and
number)
Inquire: *#61#
Cancel: ##61#
Call Forward to any number (if phone is off or unreachable)
**62*+nnnnnnnnnnnn# (replace "n" with your country code, area code and
number)
Inquire: *#62#
Cancel: ##62#
Call Forward to any number (if on another call) - this would disable Call Waiting as it would immediately forward the call to the number specified.
**67*+nnnnnnnnnnnn# (replace "n" with your country code, area code and
number)
Inquire: *#67#
Cancel: ##67#
Call Forward to any number (directly, Do Not Disturb)
**21*+nnnnnnnnnnnn# (replace "n" with your country code, area code and
number)
Inquire: *#21#
Cancel: ##21#
Check out this Wikipedia article for the same information in a different layout and with some history.
Extend Call Forward ringing time
If you find that you don't have enough time to get to your phone before it forwards to voicemail, then you can extend the time your phone rings.
Delayed Call Forward to any number (if not answered) - "Extended Ringing Time"
**61*+nnnnnnnnnnnn**[5,10,15,20,25,30]# (replace "n" with your country code, area code and
number) and choose the number of seconds from 5 to 30 seconds to delay the call forward time.
Inquire: *#61#
Cancel: ##61#
I found more information from David here.