Wall AC Charger USB Sync Data Cable for iPhone 4, 3GS, and iPod
I bought three of this item for an iPhone 3GS 16GB for spares and to use at work. I plugged the first cable in and received the notification that \\"Charging is not supported with this accessory\\" on my screen. I then tried this cable with all three power blocks with the same result. I next tried the other two cables with each power block and had the same notification pop up. I then tried each cable with my original power block with the result that the phone was charging for all three cables. I also tried 