This charger does not work with iPhone 3GS. A error message pops up on my iPhone 3GS screen saying "Charging is not supported with this accessory".I called the DataVision customer service department to request the refund only to find out that they refuse to pay the shipping fee for the return. They were claiming that this product is not supposed to work with iPhones and it is Amazon.com's fault to put a wrong description of the product. I'm really disappointed by the way they treat their customers and Amazon putting a wrong description of the product.