AT&T Caps Data Speed for Heavy Unlimited-Wireless Users

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AT&T Inc. will start slowing the data speeds of customers with unlimited wireless plans once they reach a certain threshold, a sign of the industry trying to cope with soaring traffic and limited network capacity.

Customers will experience slower access speeds if their data usage exceeds 3 gigabytes a month, the second-largest U.S. wireless carrier said yesterday on its website. For customers with so-called long term evolution, or LTE, devices, the limit is 5 gigabytes a month, the Dallas-based carrier said.