The lawsuit, filed in Miami, FL, cites a study which the lawfirms representing the plaintiffs paid for, and which claims that AT&T customers can be overcharged for data by 7 percent – and up to 300 percent. For example, an I-Phone user who downloads 50 KB would actually be billed for 53.5 KB to as much as 150 KB.
According to one of the lawyers representing the plaintiffs, the same study also revealed that AT&T bills for "phantom"data when phones weren't even in use. Furthermore, tests indicated that the billing system did not always record the correct date and time of the data usage, causing transactions to be posted to the wrong billing cycle.
The lawsuit claims the overcharging and phantom charging is systematic and could affect millions AT&T customers.