How do you call forward a cellphone?

The steps for setting up call forwarding on a cell phone depend on the model of phone and the service provider. For example, to set up call forwarding on an AT&T phone, press **21* on the keypad, then enter the 10-digit forwarding phone number, followed by the # sign.

Call forwarding is a service that allows a cell phone owner to designate a specific phone number to receive all incoming calls made to the mobile phone. Many older model phones require the user to enter a set of key instructions to activate the service, while certain smart phones offer call forwarding options as part of the built-in operating system services.