iPhone 5S Release Nears, Best iPhone Trade in Prices Arrive Next Week Josh Smith08/13/2013 The iPhone 5S announcement is as good as confirmed for September 10th, and in true Apple fashion the iPhone 5S release date could take place just 10 days later on September 20th. While there are still almost 40 days until the expected iPhone 5S release date, the best time to trade in an iPhone 4, iPhone 4S or iPhone 5 for top dollar is fast approaching. Buyers should lock in an iPhone trade in price between September 19th and September 23rd to get the best price.Advertisement The best iPhone 5 and iPhone 4S trade-in values are actually several weeks before the Apple announcement. As we approach September 10th, the iPhone 5 trade-in value could drop as much as 10-15%. This information comes from NextWorth, who tracked the average selling price for the iPhone on eBay for the months leading up to the iPhone 5 announcement last year, and found the overall value of any iPhone is set to drop. The chart below shows this decline. Read: Should I Buy the iPhone 5 or Wait for the iPhone 5S?Advertisement iPhone trade-in values will likely drop 10-20% in the next several weeks.Advertisement “There is a predictable 15-20 percent value decline seen across all older iPhone models in the six-week period surrounding the new iPhone launch,” Jeff Trachsel, CMO of NextWorth said in a statement to Gotta Be Mobile. Trachsel suggests looking into quotes for the iPhone 5, iPhone 4S and iPhone 4 right now. In the next two to three weeks iPhone trade-in prices will drop, enough that it could mean the difference between paying nothing out-of-pocket for the iPhone 5S and pulling cash out of your wallet. The iPhone 5S release approaches, and within a week prices for the old iPhone will start to drop. Users need to trade in the iPhone 5 or iPhone 4S early to get the best value, which means it is definitely time to start considering where to trade-in an iPhone or when to sell.Advertisement For most users it is too early to trade in, even though it means taking a 10% hit on the iPhone 5 trade in price, but within the next 7-10 days, users can lock in a great trade in value and keep their iPhone until the iPhone 5S release date arrives. NextWorth extended it’s 21 day price-lock to 30 days, and competitor Gazelle also offers a 30 day price-lock. Users can take advantage of these offers to lock in a iPhone trade in quote at a high price and keep using the iPhone. Amazon is another popular iPhone trade-in service, but they only offer a 7 day price lock. Read:iPhone 5S: Dual-Color, Dual LED Flash Could Capture Better Photos Any of these iPhone trade-in services will cover shipping and there is no obligation to send the iPhone in, so it’s in your best interest to lock in a price, even if you are on the fence when it comes to buying an iPhone 5S. NextWorth shares the following trade in prices which are subject to change and will vary based on condition. It’s a good idea to compare prices before locking in.Advertisement iPhone 5 Trade In Prices iPhone 5 16GB – AT&T – $314 iPhone 5 32GB – AT&T – $316 iPhone 5 64GB – AT&T – $410 iPhone 5 16GB – Verizon – $314 iPhone 5 32GB – Verizon – $315 iPhone 5 64GB – Verizon – $370 iPhone 4S Trade In Prices iPhone 4S 16GB – AT&T – $210 iPhone 4S 32GB – AT&T – $214 iPhone 4S 64GB – AT&T – $245 iPhone 4S 16GB – Verizon – $170 iPhone 4S 32GB – Verizon – $171 iPhone 4S 64GB – Verizon – $205 iPhone 4S 16GB – Sprint – $170 iPhone 4S 32GB – Sprint – $171 iPhone 4S 64GB – Sprint – $205 iPhone 4S 16GB – T-Mobile- $171 The iPhone trade in prices will drop soon. iPhone 4 Trade In Prices iPhone 4 8GB – AT&T – $135 iPhone 4 16GB – AT&T – $137 iPhone 4 32GB – AT&T – $140 iPhone 4 16GB – Verizon – $71 iPhone 4 32GB – Verizon – $73 iPhone 3GS Trade In Values iPhone 3GS 16GB – $32 iPhone 3GS 32GB – $33 Even if the iPhone is damaged with a crack or marks, it is still worth something, and could help pay for a new iPhone.Advertisement iPhone 5S Rumors The iPhone 5S will likely look like the iPhone 5 with a 4-inch Retina Display and the familiar two-tone aluminum and glass design, but inside we could see new features. At this point we expect an Apple A7 processor that could help Apple deliver better battery life and a new camera sensor that could help deliver better low-light photos. Parts point to a dual-LED flash that could help deliver a more natural flash. The video above highlights the iPhone 5S rumors in under four minutes, which will help you understand what to expect in September. Additionally we also anticipate an iPhone 5S fingerprint reader in the home button that could make the iPhone more secure, by letting users log in with a fingerprint.