A lawsuit filed last week in San Diego claims that Apple (NSDQ: AAPL) and AT&T (NYSE: T) knowingly oversold the iPhone 3G, which promised fast speeds, but was bogged down by a glut of customers using flawed devices, reports AppleInsider. The 18-page complaint was filed by William Gillis, a customer, who primarily bases his complaints on Internet reports of problems and maintains that information leaked out to the public contradicts statements by both Apple and AT&T about 3G network performance. Also this morning, there are several reports of an iPhone data outage hitting the Northeast U.S., affecting everything from email to Web browsing. 

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Of course, this isn’t the first lawsuit to surface. Last month, a lawsuit was filed claiming that the device was defective, and AT&T and Apple were forced to settle a lawsuit involving visual voicemail.

UPDATE: AT&T acknowledged that its mobile data services, such as Web surfing had stopped working for Northeastern customers this morning, but that the problem was fixed just before noon, Reuters reports. AT&T said the problem did not affect voice calls, text messages or mobile e-mail on BlackBerry devices. “We identified it as a routing issue in the way data is routed to and from wireless devices,” said AT&T spokesman Mark Siegel.