Apple is already facing one class action lawsuit alleging that customers were unknowingly using up substantial amounts of mobile data, and it now faces a second.

The issue at stake in this new suit is that the iPhone 5/5s could silently switch from Wi-Fi to LTE under some circumstances, resulting in mobile data usage even when the phone was on Wi-Fi. This was fixed for Verizon users back in September 2012, but law firm Hagens Berman Sobol Shapiro LLP claims that Apple didn’t fix it for AT&T users until more than two years later.

According to the complaint, filed in the U.S. District Court for the Northern District of California in San Jose, Apple knew about the defect “almost immediately,” yet failed to fix it for AT&T wireless subscribers for years, and did not even disclose the defect. The defect affected all versions of iOS 6 and 7 and was only resolved with the release of iOS 8.1 in October 2014.

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