Samsung Galaxy A51
Android 10.0
1. Find "Voice call"
Press the phone icon.
Press the menu icon.
Press Settings.
Press Supplementary services.
Press Call forwarding below the required SIM.
Press Voice call.
2. Divert calls to voicemail
Press the required divert type.
Key in +447836121121 and press Enable.
+447836121121
If you divert missed calls, you need to select a delay for the divert. Press the required delay and follow the instructions on the screen to select a delay for the divert.
3. Return to the home screen
Press the Home key to return to the home screen.