Apple and AT&T are facing another class-action lawsuit claiming the two companies falsely represented the iPhone's ability to support MMS messaging.

Multimedia Message Service is a standard way to transmit graphics, video clips, audio files and short text messages over wireless networks.

The suit, filed last week in an Ohio district court, alleges that the two companies were deceptive in promoting MMS as a feature on the iPhone 3GS.

Apple (NASDAQ: AAPL) launched the iPhone 3GS on June 16, with MMS as one of the new features that was not included in the older 3G model. Upon the release of the updated iPhone operating system, version 3.0, which came out June 17, both models were supposed to be able to send and receive MMS content.

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