A Comcast executive said he expects the company will roll out “usage-based billing”—what most people call “data caps”—to all of its customers within five years. Speaking with investors today (transcript), Comcast Executive VP David Cohen said, “I would predict that in five years Comcast at least would have a usage-based billing model rolled out across its footprint.” Comcast, which has about 20 million broadband customers, has rolled out caps to some of the areas that it serves, including Huntsville and Mobile, Alabama; Atlanta, Augusta, and Savannah, Georgia; Central Kentucky; Maine; Jackson, Mississippi; Knoxville and Memphis, Tenessee; and Charleston, South Carolina. Customers generally get 300GB of data per month, with $10 charges for each extra 50GB. (During the trial period, customers can exceed the cap for three months out of any 12-month period without incurring extra fees.)