You can answer a call when you're already in another call. Call waiting is a network service.
Press the call key. The first call is put on hold.
|Turn on or off, or check the status of the service|
Select > Settings and Calling > Call > Call waiting > Activate, Deactivate, or Check status.
|Swap between an active call and a call on hold|
Select > Swap.
|Connect the call on hold to the active call|
Select > Transfer. You disconnect yourself from the calls.
|End an active call|
Press the end key.
|End both calls|
Select > End all calls.