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AT&T customers surprised by ‘unlimited data’ limit

Under a new policy, AT&T has started cutting the data speeds of its heaviest users as part of an attempt to manage data usage on its network, reports the Associated Press. Mike Trang likes to use his iPhone 4 as a GPS device, helping him get around in his job. Now and then, his younger cousins get ahold of it and play some YouTube videos and games. But in the past few weeks, there has been none of that, because AT&T put a virtual wheel clamp on his phone. Web pages wouldn’t load, and maps wouldn’t render. Forget about YouTube videos—Trang’s data speeds were reduced to dial-up levels. “It basically makes my phone useless,” said Trang, an Orange County, Calif., property manager. The reason: AT&T considers Trang to be among the top 5 percent of the heaviest cellular data users in his area.  So last month, AT&T “throttled” Trang’s iPhone, slowing downloads by roughly 99 percent. That means a web page that normally took a second to load instead took almost two minutes. AT&T has some 17 million customers with “unlimited data” plans that can be subject to throttling, representing just under half of its smart-phone users. It stopped signing up new customers for those plans in 2010 and warned last year that it would start slowing speeds for people who consume the most data. What’s surprising people like Trang is how little data use it takes to reach that level—sometimes less that AT&T gives people on its “limited” plans…

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