Get Cash for Phones!
Obviously the age and condition of your device plays a huge role in its worth. If you took good care of your phone and have no cosmetic or functional damage, you can sell it without issue. Price drops pretty quickly with age,
After the first year, you generally lose the included coverage from the manufacturer. If you can sell a device under warranty—even if the remaining time only amounts to a couple of weeks—you increase the buy-ability of your smartphone. While you might not make more money, you will give buyers more peace of mind—they have recourse should you sell them a lemon—and that makes you a more attractive seller.If you have no warranty, however, you want to sell before your device falls two generations behind the latest and greatest. Once that happens, people start to forget about your smartphone. While you could still sell the thing for a decent amount of money online, older phones won't go for much locally and you'll have fewer buyers to choose from. If you want to sell your phone for a good price, you can't keep it for too long.
Courtesy: lifehacker.com