So last month, AT&T “throttled” Trang’s iPhone, slowing downloads by roughly 99 percent. That means a Web page that would normally take 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 smartphone 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.