1. From the Home screen, tap Settings.
   
2. Tap Phone.
   
3. Tap Call Forwarding.
   
4. To turn on Call Forwarding, tap the Call Forwarding button.
   Note: You must be in range of the cellular network when you set iPhone to forward calls, or calls won't be forwarded.
   
5. Enter the desired forwarding number, then tap Back.
   
6. The Call Forwarding icon appears in the status bar when call forwarding is on.
   
7. To change the Call Forwarding number, tap Forward to.
   
8. Enter the desired forwarding number, then tap Back.
   
9. To turn off Call Forwarding, turn off the "Call Forwarding" toggle.Your settings will automatically be saved.
   
10. Press the Home button to return to the Home screen.