At least Sprint has an unlimited data plan. AT&T currently offers 200MB and 2GB plans, but AT&T's changes have nothing to do with broadband. Instead, AT&T is changing their texting plans. Engadget got an anonymous tip on the upcoming changes. The new texting plan is $10 and includes 1,000 messages per month. Go over that and you'll be dinged 10¢ per message. The $5/200 message plan and $15/1,500 message plan are being dropped. This should happen in just a few days on January 23. As is usual, you won't be affected if you have one of the older plans unless you make a change to your plan.
There are other changes in the works for AT&T as well. Their 3G MicroCell will now cost $199 instead of $149 for example. Once you read all of the changes Engadget is listed, you have to be thinking that someone at AT&T thinks they are so loved as a network they can make half a dozen changes to the detriment of the consumer and not suffer for it. Those aren't changes I'd be making if my exclusivity with the number one selling smartphone ever was ending in the next two weeks.