Another day, another T-Mobile deal. Starting September 3, you will be able to add a tablet (any tablet) to a postpaid Simple Choice phone plan for only $10 per month, and T-Mobile will match your LTE data plan (up to 5 GB per month) specifically for the tablet. So if you happen to have a 5 GB plan for your phone, you will also get an additional 5 GB for your tablet.
I was thinking of selling both and getting a 10 inch powerhouse for basically anything I would need. My only regret is androids utter lack of decent mmorpg games. Aside from that I don't see a reason to own a laptop.