The test, beginning in Reno, Nevada today, will "evaluate a usage-based model that could potentially help address today's trend of explosive bandwidth usage, [and] may be extended to one other market by the end of the year," said AT&T.
Anyone in Reno who uses over 150 GB per month will automatically be enrolled in the full bandwidth trial at the end of the year.
Any trial participant that exceeds the limit will be given a one-month grace period but if they do it again they will be fined $1 for every GB over they go.
Unlike Comcast however, AT&T will provide all customers with a "bandwidth measuring tool" and will also notify customers when they have hit 80 percent of their limit.
"A small group of customers are using the majority of bandwidth on our network," added AT&T. "In fact, almost 50 percent of total bandwidth is used by just five percent of customers – customers, for example, who are uploading and downloading the equivalent of more than 40,000 YouTube videos or 40 million e-mails a month. This kind of heavy usage has an impact on all of our customers."