NEW YORK (AP) — AT&T says it’s going to start limiting speeds for the 5 percent of its customers with “unlimited” data smartphone plans who clog the airwaves the most.

The company said Friday it will put the measure into effect Oct. 1.

T-Mobile USA already throttles users who go over certain limits for data consumption.

AT&T stopped signing up new customers for “unlimited” plans last year. Instead, it now lets heavy users pay extra when they go over a certain data allotment. Verizon Wireless also recently stopped signing up new customers for unlimited service.

AT&T says it will warn users who approach joining the top 5 percent, and anyone subject to the speed limits will experience them at least until the next billing cycle starts.

From the breaking news you need to know to the hottest trends circling the Web, TheBlaze has it all. Follow us on Facebook, Twitter, Instagram, Snapchat and Periscope.