You know all that AT&T moaning where the company said it had a great network but accused iPhone users of being “data hogs” as an explanation for network patchiness? Well, it seems the company may have been telling some fibs, and there’s a new lawsuit in town that seeks to prove it.

“AT&T has ‘systematically’ overcharged iPhone and iPad owners with capped data plans by inflating the amount of data they download and adding ‘phantom traffic,’ a lawsuit claimed last week,” Computerworld reports.

Naturally, AT&T intends mounting a vigorous defence of itself against the suit, filed by Patrick Hendricks.

The lawsuit also claims a “significant portion” of AT&T’s $1.1 billion of wireless revenue gains last quarter came from the bogus charges and overbilling, the report explains.

“AT&T’s billing system for iPhone and iPad data transactions is like a rigged gas pump that charges for a full gallon when it pumps only nine-tenths of a gallon into your car’s tank,” the complaint read.

We wonder how this will go….