Well, I use the phone to switch back and forth, but it does become annoying that you have to actually dig in your pocket, find the phone, look at where the incoming call is coming from and then press send button to switch to the second line.
Switching back using phone itself works fine again, but its so irritating.
Why cant this be fixed and we get caller ID on the screen as well as functionality to switch between callwaiting calls from the wheel or at least iDrive?