What's moving your money. >> it's the end of an unlimited da ta plan. they are going to see much slower speeds if they exceed a new monthly usage cap. the new limit applies to about 17 million subscribers. it also means they are going to have to start paying more as they download things like video, music, and use more applications. the problem is at&t's user base is no longer growing as quickly as before. to make up for the revenue, there's a move towards more expensive data plans. there's no wonder when you consider that carriers not just at&t, but verizon, they have been spending billions of...