Open the Phone app
Tap Keypad
Dial the call divert code for your carrier
Press Call
To divert all calls, use the unconditional forwarding code provided by your carrier
To divert when busy, use the busy forwarding code provided by your carrier
To divert when unanswered, use the no-answer forwarding code provided by your carrier
To divert when unreachable, use the unreachable forwarding code provided by your carrier
To check whether call divert is active, dial the carrier’s status code
To cancel call divert, dial the carrier’s deactivation code
If needed, contact your mobile carrier for the exact codes and setup steps