I used NextWorth to sell my “old” iPhone (EPHT3GCK7PYK) before and got a good deal. I sold both a 3G and a 2G phone at the time. It’s a great service and easy to use. You simply enter the phone you want to sell, it’s condition, and they give you a quote. Once you accept the quote (and enter all your info) you have 21 days to send in your phone. You print the shipping labels right at home. It’s so easy. Within a week of receiving your phone they send you the money (I choose the PayPal option). With my iPhone 4 now ordered, I went ahead and set up for both my 3Gs and my wife’s 3G to be sold. It couldn’t be much easier, and the prices are fair. Sell your iPhone.