AT&T confirmed Friday it will slow speeds for the 5% of its subscriber base who use the most data, but that it will restore full service for these users at the start of each billing cycle. The plan, which will take effect Oct. 1, is aimed at battling congestion on AT&T's networks by targeting those who use about 12 times the amount of bandwidth of the average smartphone user. "Even as we pursue this additional measure, it will not solve our spectrum shortage and network capacity issues," AT&T said in a statement.

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