stock the new phone although no tariffs have been released yet. How to get the best deal for your old iPhone If you're planning on getting the new model, either by buying it outright or through a contract, you can make some extra money by selling off your old model. Hundreds of people have already cottoned on to this and since July there's been a 400% increase in iPhone re-sales via mobile phone trade-in comparison site sellmymobile.com . On the site the iPhone 4S, 4 and 3S are the most popular handsets to trade in, but the amount you can get back has fallen by 10% since July so if you're looking to trade your old phone before getting the iPhone 5 you'll need to act fast. How much is my old phone worth? The iPhone 5 is set to retail at a hefty 529 for an unlocked 16GB version. This means if you can trade-in your old phone it'll cut a large sum off the price of the new handset. There are several trade-in (or recycling if you prefer) websites around and on sellmymobile.com the top price for a 64GB iPhone 4S across these sites is now 325. Older models will still fetch a pretty decent return of 172.61 for a 16GB iPhone 4 and 87 for a 16GB 3GS model. The bonus of using sellmymobile is that if you do find the phone you've traded in at a higher price on another website within 24 hours of the