AT&T will put a leash on smartphone hogs.
AT&T says it will start limiting speeds of the 5 percent of its customers with unlimited data smartphone plans who clog the airwaves the most. Usually those users stream video or play certain online games. The limit will take effect October 1. AT&T stopped signing up new customers for unlimited plans last year in favor of having heavy users pay extra when they go over their allotment. The company issues warnings when users are joining the top 5 percent. Anyone in that group will be subject to speed limits until the next billing cycle. It only applies to data usage over the cellular network, not over wifi. T-Mobile already has a similar limit, and Verizon Wireless recently stopped singing up new customers for unlimited service.