If you are annoyed by the call waiting tone that plays when you are on a call and a second call comes in, the is a way to turn it off.
Here are the steps:
- Press the "Menu" button on the phone
- Choose the "Features" option
- Select "Call Waiting"
- Choose option "2. Call Tone"
- Set to "Disable"
Now you will not have a tone play when a second call arrives.
Warning: Do NOT turn off Call Waiting all-together. You phone will be unable to take a second call without this setting enabled.