All you need is the cellular in the tablet and the apps to do that. Not that challenging to those that write apps.
The idea is not new, been done before but will folk pay for this?
I am working on in this direction, right now I am testing a voip app in ipad2 3g with a data only plan, that is call Dellvoice, and I can get a local number from them. But I want to find a way to use this on android 4.0 phone and get the bluetooth headset to get the phone ring out of it and push the answer button to take or end the call. Is this something possible?
I prefer something around 7", I saw the note 10.1 3g, but is expensive, if all this idea work then it is a different story.
any suggestion to make this idea work?