Comcast to start charging for using too much data

However, the limit is pretty high -- 300 gigabytes per month. That would deliver 1,000 hours of movies.

Comcast says only a fraction of customers use that much data. Comcast says the new fee may be $10 for every 50 gigabytes over the limit.

Time Warner and AT&T tried limiting data use for home Internet service, but they dropped the plans because of fierce opposition from customers.

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