Chance Miller, writing for 9to5mac:

> AT&T today has revealed a slight change to how it is handling throttling users grandfathered into unlimited data plans. Up until today, AT&T has throttled unlimited data users when they hit 5GB of usage and are in a congested area. As a reader has pointed out to us this evening, however, the carrier has updated its website with a new policy for throttling those on an unlimited data plans…

From the AT&T web site:

> We recently revised our practices such that Unlimited Data Plan smartphone customers can now use 22GB of high-speed data during a billing period before becoming subject to network management practices that might result in reduced data speeds and increased latency. > > As always, Unlimited Data Plan smartphone customers will still have the comfort of knowing that, no matter how much data they use in a billing cycle, they will continue to pay a single monthly flat rate. That is the essential promise of the Unlimited Data Plan, and we are pleased to continue honoring that promise. Further, speed reductions will occur only when the customer is using his or her device at times and in areas where there is network congestion and only for the remainder of the current billing cycle after the customer has exceeded the 22GB data usage threshold. > > We will notify customers during each billing cycle when their data usage reaches 16.5GB (75% of 22GB) so they can adjust their usage to avoid network management practices that may result in slower data speeds.

If you’ve got one of those vintage AT&T unlimited plans, good to know what the rules are.