Vodafone 575
Find "Additional call settings"
Press the Menu key.
Press Settings.
Press Call settings.
Press Additional call settings.
Turn call waiting on or off
The current settings are displayed.
Press the indicator next to "Call waiting" to turn the function on or off.
Press the indicator next to "Call waiting" to turn the function on or off.
Return to the home screen
Press the Home key to return to the home screen.