The code for call forwarding is *72. The code to deactivate call forwarding is *73. The codes are standard for landline carriers throughout the United States. Cellphone carriers charge for cellphone minutes when the call forwards to the cellphone and somebody answers the call.
There are also codes for call forwarding when the line is busy or there is no answer. For example, *90 forwards the call only if the line is busy but not if there is no answer, while *91 deactivates this feature. The code *92 forwards calls only if there is no answer but not if the line is busy, while *93 deactivates this feature. Additionally, *68 forwards calls if the line is busy or if there is no answer, and *81 deactivates this feature.