AT&T Inc. said it would begin to cap DSL data usage for its customers and begin to implement charges for anyone who goes over the limit.

The Dallas telecommunications giant said that customers who went over a limit of 150 gigabytes of data a month three times would be charged $10 for every extra 50 gigabytes of data they consume. Customers on its higher-end U-Verse Internet service have a limit of 250 gigabytes. AT&T will impose the new limit on May 2. Get the full story »