This undated screen grab provided by Mike Trang shows a warning message on the screen of Trang's iPhone that he received advising he was in danger of having his data speeds throttled. (AP Photo/courtesy of Mike Trang)
AT&T customers surprised by data limit
AT&T has some 17 million customers with "unlimited data" plans that can be subject to throttling, representing just under half of its smartphone users. It stopped signing up new customers for those plans in 2010.
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