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We’ve long anticipated Apple unveiling a new iPhone this fall, we just weren’t sure exactly when it would do it. Then over the weekend, a report surfaced claiming the company was planning an event for September 10, and it’s since been all but confirmed.

For the folks looking to sell their old models, that gives you a little less than a month to do so before the next iPhone is introduced. By then, your current-model iPhone will be worth a lot less than it is now—in fact, its value is already swiftly depreciating…

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The above chart was constructed by the folks over at NextWorth, a gadget reseller, and it takes a look at the average selling prices for the iPhone 4S, 4 and 3GS leading up to the unveiling of the iPhone 5 last year. Notice how they sharply decline through August.

This essentially means if you want to get top dollar for your current iPhone, you’ll want to sell it as soon as possible. And don’t worry, for those of you that need to keep the device until the new one arrives, some gadget resellers are offering 30-day price guarantees.

That being said, while resellers like NextWorth and Gazelle offer easy ways to unload your old gadgets, they don’t offer top-tier pricing. In fact, I’ve found that their offers for my old iPhones have typically been about half of what I could make selling them on eBay.

Here’s some cash offers I found for a used 16GB black (unlocked) GSM iPhone 5:

  • Amazon – up to $320.75
  • Gazelle – up to $320
  • NextWorth – up to $314
  • GameStop – up to $310
  • eBay – up to $510

Of course, these prices are all subject to the condition of the phone, and when you sell it. I probably won’t be selling my iPhone 5 this year, but I do have an iPhone 4S and some other 30-pin devices that I’m looking to unload soon. And yes, I’ll definitely be using eBay.

How about you? Do you plan on selling an older iPhone to help pay for a new one?