This feature combines Caller ID and Call Waiting. A beep alerts you to a call coming in, and the visual Caller ID display on your phone will show the name and number of the person calling. Answer it or ignore it - it’s up to you.
Call Waiting Caller ID is included in the price of your Phone service.
To take a second call, put the first call on hold by pressing the Flash button or quickly press the switch hook on your phone. To put the second call on hold and go back to the first, press Flash or the switch hook again.