Even after being sued by the FTC for throttling its unlimited customers, AT&T is still conducting business as usual. 
Here’s how it works: Customers who have 3G or non-LTE 4G phones and "legacy unlimited data plans" are throttled for the remainder of the billing period after they exceed 3GB of data in a month, but only "at times and in areas that are experiencing network congestion." 4G and LTE are practically synonymous these days, but AT&T also applies the 4G label to its HSPA+ network technology.
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