Iphone will not charge via usb-to-computer nor via brick; I've tested with two different cables. Just before this problem arose, I got messages similar to "This accessory is not made to work with iPhone."

Question

Most of my concern is in the subject line. I probably should've saved some content to include here. Allow me to elaborate:
While traveling with the tiny brick, I got a message on my 3GS phone that "This accessory is not made to work with iPhone”; however, the charger was working fine with another phone and with an iPad.
I tested alternatives by removing and re-inserting the cable (obviously, as I tested other devices), changing wall receptacles, shutting the phone off (all the way), all to no avail.
When I got home, I plugged a different cable--one that was connected to my iMac rather than the brick--into the my 3GS; it still didn't charge.
So, I'm hypothesizing that perhaps some debris (from a pocket?) got into the charging receptacle of the 3GS and is disrupting the connection. Perhaps there are other hypotheses.
I am reluctant to do a reset, as (a) the problem doesn't appear to be a software issue (the phone and software are all working, though the charge is declining) and (b) I don't want to lose the contents before I can sync it (now that I'm home, again).
I'd welcome suggestions. Meanwhile, I suppose I shall e-mail photos and notes from the phone to myself before I lose the remaining charge.

Answer 1

Try to clean the 30-pin receiver slot either by blowing air into it or using a microfiber cloth. If the problem persists, based on what you've already said, I'd say the problem is most likely hardware, and would need to be replaced or repaired. I hope your iPhone is still under the 1-Year Manufacturer Warranty, or if applicaable extended warranty. You can check by calling AppleCare National iPhone Technical Support at 1 [phone].