1. Find "Call forwarding"
Press the phone icon.
Press the menu icon.
Press Calling accounts.
Press the name of the SIM.
Press Call forwarding.
2. Divert calls to voicemail
Press the required divert type.
If you divert missed calls, you need to select a delay for the divert. Press the drop down list below "Delay" and follow the instructions on the screen to select a delay for the divert.
Key in +447836121121 and press ENABLE.
3. Return to the home screen
Press the Home key to return to the home screen.