A second plaintiff has joined the lawsuit against Apple regarding problems with its iPhone 3G, giving the company until Sept. 10 to respond to charges that it sold a defective device under false marketing promises.

Wilton Lee Triggs II is now the second complainant on the lawsuit initially filed Aug. 19 by Jessica Alena Smith, regarding the purchase of 3G iPhones from a Birmingham, Ala. Apple store this summer.

The suit, filed by the Birmingham-based Trimmier Law Firm, states the plaintiffs have suffered "significant monetary and non-monetary damages" due to the "defective" devices. According to the suit, their iPhones allegedly do not provide the data speeds and voice call connectivity promised in Apple advertising. The lawsuit also aims for class-action status, claiming it's also being filed on behalf of the "millions" potentially affected by defective iPhones.

The latest development comes two months after Apple's second phone took the mobile device industry by storm, selling one million devices during the weekend of its launch.

It's also the latest snag for the new device, which for weeks since launch has suffered persistent problems with its MobileMe online service, while a firmware update to existing models may have posed additional activation difficulties in the wake of the debut.

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