Unlike Eco New Direct, this vendor offers more money and does not threaten to keep my phone if we cannot come to terms about what it's worth. But, it doesn't provide any valid contact information, so if I'm dissatisfied, I cannot contact them except through an online form. I refuse to do business with a company that doesn't provide valid contact information, especially when it forces me to accept a terms and conditions contract.

looks a little better, and its online form isn't static like some of the others. You can change the options on the form to see different prices. This vendor is offering $79 for a working, undamaged iPhone 3G with 16GB in fair condition with no other items included. It lists several shipping options, and says it will provide a free shipping label. Also, on the plus side, this vendor provides a full street address in Denver, but no phone number.

Among the trade-in Web sites, Eco New Direct, MyBoneYard, and BuyMyTronics appealed to me the least. None of them advertise that they wipe the device, or mention a timeframe between receiving your property and sending your compensation. If you're a company that's planning to resell a number of iPhones, there are many other options. If you have a local outlet that pays or trades-up for used iPhones, I'd negotiate with them first so you can walk away if you are unsatisfied with their offer.

Alternatively, you could sell your iPhone to individuals on or . Prices vary based on condition and accessories, but shipping is rarely free and you'll have to wipe the data yourself. If, however, you can sell it for quite a bit more through one of these services, you can ship it in a USPS flat rate box for under $5, so it might be worth it to try eBay or Craigslist.

Wipe the iPhone before you resell it