AT&T last year discontinued unlimited data plans for iPhones and transitioned to a tiered pricing structure. Photo: Jon Snyder/Wired.com

An iPhone customer has filed a lawsuit against AT&T, claiming that the telecom company is overcharging him for data services.

Filed by Patrick Hendricks in the Northern District of California, the lawsuit seeks class-action status, alleging that AT&T is committing unlawful and fraudulent business practices by regularly overbilling customers for data transactions.

“AT&T’s billing system for iPhone and iPad data transactions is like a rigged gas...