I really don’t know. I’ve been “married” to T-Mobile for so long, I haven’t paid attention to other carriers or their plans. T-Mobile has treated me very well, and offers World Class Service.
You should go to: http://www.howardforums.com/index.php?, and scroll down. There are discussions for each carrier, and their plans. If you can’t find the answer, readily, sign up and post the question there. That’s an amazing website with resources than any I’ve ever encountered.
Sorry.
T-Mobile Will Drop Its Second Android Phone, The myTouch 3G, This August For $199.