I think they just made it illegal to root phones. Thems with the money writes the laws. It's grandfathered, so if you do root say ya did it before 2/1/13. I think they don't want their subsidized phones switched to another provider.
The netzero is too limited for me, I use easily 2GB a week. Guess I'll keep uverse awhile, 45$ a month 250GB cap.
Don't trust the unlimited mobile plans, they throttle the speed back after a certain amount of data. Always give the customer something to complain about, chance to upsell. "Oh, you want unlimited AND fastest speed, that's our super duper really unlimited plan pro."
So try speedtest, and see if you get what was promised.