i've noticed something that bugs the heck out of me. When I am on the phone and I receive another call, there is option to DROP the call I am on and answer the incoming call.

The reason why this bugs me is because many times it has happened when I call someone, it goes to their voicemail, and while I am leaving a voicemail they call me back. So while i'm leaving a voicemail i have an inbound call coming and there is no way to DROP the current call I am on and then answer the incoming call. What this means is that I have to answer the incoming call, tell them that i'll call them back and then drop both phone calls.

Any suggestions or secrets?