Just started getting intermittent error on my 3G:This accessory is not optimized for iPhone..." but nothing is connected or plugged in to it or anything?

Was just checking my iPhone and when I pressed the home button to wake it up the message "no sim installed" was on the screen,  obviously it was so I restarted the phone, that cleared it but then I started intermittently getting a popup message "this accessory is not optimized for iPhone...(don't remember the rest), did a hard reset and still happening once in a while, there isn't anything plugged into or connected to my phone at all though, would appreciate any help or advice please

The most common reason for message "this accessory is not optimized for iPhone" with nothing plugged in, is dust, debris etc. in the iPhone dock port. Clean the dock port with a clean dry toothbrush. If the message returns again, clean the dock port again very carefully using some isopropyll alcohol, especially the pins which are on top of the dock mid rib.

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