Answer a waiting call
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.
Select 
> Settings and Calling > Call > Call waiting > Activate , Deactivate, or Check status.
Select 
> Swap .
Select > Transfer . You disconnect yourself from the calls.
Press the end key.
Select > End all calls .