A complaint titled "Apple & ATTM Antitrust Litigation" has been granted class-action status by judge James Ware of the US District court for the Northern District of California. The complaint accuses Apple and AT&T of forming an iPhone monopoly.
The class-action status designation on this complaint signifies that "the plaintiffs now represent everybody who's bought an iPhone in the United States". Those plaintiffs are accusing Apple and AT&T of arranging a monopoly:
Originally filed in 2007, the class-action lawsuit alleged that Apple and AT&T had illegally exerted a monopoly by telling customers their iPhone contract was two years long when in actuality the companies' exclusivity agreement was for an indefinite, undisclosed amount of time. That means even after iPhone customers' two-year contracts have expired, they still don't have the option of switching to another carrier because AT&T is still Apple's only U.S. partner.
Since that original filing, it has been revealed that Apple and AT&T did sign a five-year agreement in 2007 which appears to be part of what pushed the status change on this complaint.