If you cannot answer your calls, you can forward incoming calls.
Select Settings and Calling > Call forwarding > Voice calls.
Call forwarding is a network service. For details, contact your network service provider.
Select If not answered > Activate > To voice mailbox.
Select If busy > Activate > To voice mailbox.
More than one forwarding option can be active at the same time.
Select All voice calls > Activate > To other number.
Enter the number. To use a number saved in your contacts list, select Find.
Call restrictions and call forwarding cannot be active at the same time.