Find "Call forwarding"
Press the menu icon.
Press Settings.
Press Call.
Press Call forwarding.
Select divert type
The current settings will be displayed.

Press one of the following options:
Always forward
Always forward
Forward when busy
Forward when unanswer
Forward when unreacha
Divert calls to voicemail
Key in +61414121121 and press Enable.
If you choose to divert all calls, the divert icon is displayed in standby mode.
Exit
Press the Home key to return to standby mode.