Samsung Galaxy A12
Turn call waiting on or off
When call waiting is turned on, you can answer a new call without ending your ongoing call.
Press the phone icon.
Press the menu icon.
Press Settings.
Press Supplementary services.
Press the indicator next to "Call waiting" below the required SIM to turn the function on or off.
Press the Home key to return to the home screen.
1. 1. Find "Supplementary services"
2. 2. Turn call waiting on or off
3. 3. Return to the home screen