Find "Additional settings"
Slide your finger down the display starting from the top edge of your phone.
Press the settings icon.
Press the settings icon.
Press SETTINGS.
Press Call.
Press Additional settings.
Turn call waiting on or off
The current settings are displayed.
Press Call waiting to turn the function on or off.
Press Call waiting to turn the function on or off.
Return to the home screen
Press the Home key several times to return to the home screen.