Summary Box: AT&T relents on data plan limits

THE COMPLAINTS: Critics say AT&T Inc. has placed unreasonable limits on the “unlimited data” plans it offers smartphone subscribers.

POLICY CHANGES: AT&T says that from now on, it will only slow down service for its “unlimited data” subscribers when they hit 3 gigabytes of usage within a billing cycle. Previously, the company had been throttling service when subscribers entered the heaviest 5 percent of data users for that month and that area.

ABOUT THE PLANS: AT&T doesn’t sell the “unlimited data” plan any more, but subscribers have been allowed to keep it.