[quick99si]

Have you always used the same USB cable for the computer/wall/car attachments? If so, try another one.

Otherwise, while being careful not to cause further damage, check out the port on your phone and see if it moves at all when you apply pressure with something like a toothpick or plastic fork piece. It's possible that one or more of the solder joints on the charger port have come loose from the main board. Or maybe one of the metal pins are erroded to the point of not making contact with the corresponding pin on your USB cable.