Apple iPhone 12
Turn call waiting on or off
When call waiting is turned on, you can answer a new call without ending your ongoing call.
Press Settings.
Press Phone.
Press Call Waiting.
Press the indicator next to "Call Waiting" to turn the function on or off.
Slide your finger upwards starting from the bottom of the screen to return to the home screen.
1. 1. Find "Call Waiting"
2. 2. Turn call waiting on or off
3. 3. Return to the home screen