An AT&T logo seen outside an AT&T store.

Enlarge / An AT&T store in Washington, DC, on April 21, 2015. (credit: Getty Images | Bloomberg)

AT&T yesterday announced three new "unlimited" data plans. Keeping track of all the different limits on AT&T's unlimited mobile plans is just as difficult as ever, but there's some good news for customers who use lots of smartphone data.

Buying AT&T's cheapest unlimited plan still comes with the risk of getting your data throttled to speeds slower than those provided to other customers when the network is congested. The possible throttling can be imposed at any time, even if a customer hasn't used much data that month. But while upgrading to pricier plans currently only gives AT&T customers 22GB a month before possible throttling, the plans coming out soon have options for at least 50GB or 100GB of un-throttled use.

AT&T's current entry-level plan is called "Unlimited & More." It costs $70 per month for one line (not including taxes and fees), with the per-line prices descending with each additional line you buy. Each line costs $40 a month if you buy four lines.

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