It looks as though the unlimited data wars are extending to cars and trucks thanks to a partnership between AT&T and General Motors. AT&T, which was the last major U.S. wireless company to revitalize its unlimited data plan offering, is providing a $20 a month prepaid unlimited data plan for in-car use on Chevrolet vehicles.

According to

Source: Hot Hardware – Chevy And AT&T Announce Unlimited LTE Data Plan For Cars