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You will need to set your mobile phone to Call Forward to <YOUR CUSTOM SERVICE> voicemail number. You can usually set your phone to forward only when the phone is busy (when you are talking on it), only when you don’t answer it, or in both cases. Some carriers have a third condition for when the phone is off or outside the service area.
Here is the information we have collected on how to forward cell phones from the various carriers:

Verizon Wireless:
Busy: Dial *92 then the 10-digit number to forward to then press your call button. To deactivate, dial *920 and press your call button.
No Answer: Dial *90 then the 10-digit number to forward to then press your call button. To deactivate, dial *900 and press your call button.

AT&T Mobility:

The codes vary according to which network you are subscribed to and which kind of telephone you have. Please go to the AT&T Mobility Call Forwarding information page for all the gritty details.

In practice, we have found that it is often necessary to call AT&T Customer Service to get your Call Forwarding set up correctly.

Sprint PCS:

Busy: Dial *74 then the 10-digit number to forward to then press your call button. To deactivate, dial *740 and press your call button.
No Answer: Dial *73 then the 10-digit number to forward to then press your call button. To deactivate, dial *730 and press your call button.

T-Mobile:

T-Mobile does not use activation and deactivation codes. You must navigate the menus on your phone to set up Call Forwarding. For assistance, please call 1-800-T-MOBILE.

Nextel:

Nextel does not use activation and deactivation codes. You must use navigate the menus on your phone to set up Call Forwarding. For assistance, please call 1-800-639-6111.

Note that some carriers charge for forwarded calls the same as a regular call, while others charge a flat per-minute fee for forwarded calls.