IPhone 3GS message: "Accessory not optomized..."

On my way to Walgreens...plugged iPhone 3GS into my car charger (non-Apple product) and suddenly the message said: "Accessory not optomized for this iPhone...You may experience noise caused by cellular interference and a decrease in cellular signal strength." Now, even without the charger plugged in, the message pops up about every 20 seconds, and the ringer won't work. I'm also getting no sound from the external speaker. I tried shutting the phone off and a hard reset...nothing works. Please help!!!

Check the dock connector on your iPhone for dirt/lint/debris etc. and clean it.

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