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If you can't answer your calls, you can divert them to another number.
Find "Call forwarding"
Press the phone icon.
Press the menu icon.
Press Voice call.
Press Call forwarding.
Select divert type
The current settings are displayed.
Press one of the following options:
Forward when busy
Forward if unanswered
Forward if unreachable
Divert calls to alternative number
Key in the required number and press Enable.
Return to the home screen
Press the Home key to return to the home screen.