AT&T has quietly increased the cost of its old unlimited plans by $5 per month. The price jump is the second in a year from AT&T. "If you have a legacy unlimited data plan, you can keep it; however, beginning in March 2017, it will increase by $5 per month," said AT&T. After the increase, the old unlimited plan will cost $40 per month. Device access fees, and talk and text services are extra. AT&T throttles its grandfathered unlimited customers once they surpass 22 GB of mobile data per month. Like Verizon Wireless, AT&T stopped offering unlimited plans years ago.


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