Hmm, interesting. I've never thought of that before.
My *Guess* is that it wouldn't work. I think you need to call your service provider to get the definite answer on that.
Although if you did get a tablet, you could have the same set up I'm using. I have an android phone and the tablet S. I have the Tablet using my phones 4G data through tethering. Also they're connected through bluetooth so I can send and receive all my texts from the tablet as well (with textab installed on phone and tablet). I leave my phone in my jacket and I only need to take it out if I'm making or receiving a phone call (Textab also instantly notifies you if the phone is ringing too)
Having an android phone and tablet is a great combo and I'd reccommmend it to anyone. I think having a tablet completely work as a phone would be good too as long as you have a bluetooth headset for it....but I can't imagine having to pull out a tab if you're on the go and having to do a lot of texting. Having the pair certainly leaves you in the most flexible position
----Oh yeah, I thought I'd add this on, and this is certainly just MY opinion so ignore it if it's terrible lol
But if you do get a tablet, I'd never reccommend getting a 3G one. You have to pay extra for it's own data plan, you could potentially get a long term contract for it, it costs more than the wifi only model, and I can't imagine too many times most people will find themselves with a tablet and no phone. It's usually the reverse there lol. The only good thing about a 3G tab is just that it can have internet when you don't have your phone and are in an area with no wifi. How often is that? lol