App programmers are using a virtual environment that emulates that model phone to do their development work on. It's not a real phone, it's not linked to a real phone, it can't text or call, etc. All it can do is pretend to be a phone so that they can test their apps.
You might be able to run some kind of VNC server on the phone and connect to it on the computer, so that you can operate the phone remotely from the computer, but I'm not sure how this, or what you're asking, would solve the problem of the tether being interrupted when you text or call. What service do you have? Many cell networks are not capable of simultaneous data and voice service, which would explain the data interruption when you take a call.
Last edited by suicidaleggroll; 04-10-2013 at 08:08 PM.