Apple's biggest September event in years is roughly five weeks away, and if you're sitting on an iPhone 14, 15, or 16, the clock is ticking on its resale value. This isn't speculation — it's a pattern that repeats every single September, backed by real trade-in data. The question is whether you act now or watch the value slide after the keynote.
When Is the Apple Event and Why Does It Matter for Resale?
Most analysts now point to Wednesday 9 September 2026 as the date for Apple's keynote, with new devices on sale from Friday 18 September. At that event, Apple is expected to unveil the iPhone 18 Pro, iPhone 18 Pro Max, and the first foldable iPhone — reportedly to be called the iPhone Ultra. The standard iPhone 18 is a different story: multiple credible reports suggest it won't appear until spring 2027 as part of a new split-launch strategy.
None of that matters for your wallet as much as what happens to older iPhone values the moment Tim Cook (or whoever takes the stage) announces the next generation.
The Value Drop Is Predictable — and It's Already Starting
The data on this is consistent across multiple years. Older iPhone trade-in prices dip around 9% immediately after Apple officially announces a new generation. That alone is a meaningful hit. But the real cliff comes once the new devices actually ship: previous models then see a further depreciation of roughly 20% as the market pivots to the latest hardware.
That two-stage drop — announcement shock, then launch reality — is why late July to mid-August is historically the strongest sell window for anyone holding a phone that's about to become two or three generations old. The iPhone 15 series depreciated by over 55% on average in its first year alone, and it's now entering its third year. That rate does not improve.
The advice from the data is blunt: sell before mid-August if you want the best return. Every week you wait from here narrows the gap between what you'll get and what the phone was worth a month ago.
What Is My iPhone 14, 15 or 16 Actually Worth Right Now?
UK resale values vary by model, storage, and condition, so treat these as directional rather than exact — condition and carrier lock status make a real difference. As a general steer based on current UK market data:
- iPhone 14 (standard, good condition): Roughly £150–£260 depending on storage and condition. Pro models hold more.
- iPhone 15 (standard, good condition): Meaningfully higher than the 14, but depreciating around £10–£15 per month right now at this stage of its lifecycle.
- iPhone 16 (standard, good condition): Still in a relatively strong window — Apple's trade-in values for the iPhone 16 were sitting around £440 and the 16 Pro around £575 earlier in 2026, though third-party cash buyers typically reflect open-market rates rather than credit-only offers.
What all three models share: values will be notably lower by October than they are today. If you're on the fence, the fence gets more expensive every week.
How Much Will My iPhone 14 Be Worth After the iPhone 18 Launch?
Less than it is now — probably significantly less. The iPhone 14 is already in its fourth year. Once the iPhone 18 Pro launches, the 14 will be three full generations behind the current flagship. Based on historical patterns, you could be looking at a further drop of 12–20% in the weeks surrounding the September announcement alone, on top of the steady monthly depreciation already eating into its value. A phone worth £200 today could realistically fetch £160–£175 by October — and that assumes no cosmetic issues.
Should I Sell My iPhone 15 Now or Wait Until September 2026?
Sell now. The iPhone 15 launched in September 2023, which means it will be three years old when the iPhone 18 keynote happens. The resale market prices in age ruthlessly, and a phone entering its third year at the moment of a new-generation announcement faces a double hit: the standard post-keynote drop, plus the psychological shift that moves buyers toward phones with longer software support windows ahead of them. There is no realistic scenario where waiting until after September gets you more money for an iPhone 15.
When Is the Best Time to Sell an iPhone in the UK?
The ideal window is 14–30 days before Apple's annual iPhone announcement — which, this year, means right now through to around mid-August. After that, you're racing the clock. Resale prices tend to level off through January, then remain relatively flat until summer, before dropping sharply again in September as new devices land. The pattern is consistent enough that you can plan around it.
This year carries additional weight. The iPhone 18 Pro event is shaping up to be Apple's most attention-grabbing keynote in years — a foldable iPhone will dominate headlines, enthusiasm for new hardware will be high, and demand for older models will soften accordingly. The more exciting the new launch, the harder the previous generation tends to fall.
Why Sell to Tech4Cash Before the Event?
The practical problem with selling a phone privately right before a major Apple event is that every other iPhone owner has the same idea at the same time. Marketplace listings pile up, buyers get choosy, and the competition keeps prices suppressed — which ironically means you often get less, not more, by going it alone in August.
Tech4Cash removes that friction entirely. We collect from your doorstep across the North East and Manchester, verify your device with PhoneCheck, and pay you the same day — no waiting for a buyer, no back-and-forth on condition, no posting risks. You can get a quote and book a collection without leaving the house. We buy iPhones across all conditions, so a minor scratch or a battery that's seen better days doesn't mean you walk away empty-handed.
If you're curious about how we assess condition and what affects your quote, our device grading guide explains exactly what we look for and why — no surprises when the engineer arrives.
If You're Buying, This Is Actually Good News
The post-September value drop cuts both ways. If you're not selling but looking to pick up a solid iPhone without paying full price, the weeks after the new launch are historically when refurbished prices on older models become genuinely compelling. A refurbished iPhone bought at the right price has already absorbed the steepest depreciation — meaning you lose far less if you ever sell it on. You can browse our current refurbished iPhone stock to see what's available now, and keep an eye on what lands post-event.
The Bottom Line
Apple's September 2026 event is expected around 9 September, with new iPhones in customers' hands from 18 September. History says the best time to sell an older iPhone is in the window before that announcement — and that window is closing. If you've got an iPhone 14, 15, or 16 you're planning to move on, the time to act is now, not after the keynote.
Get a same-day quote from Tech4Cash — we'll collect from your door and pay you before the event changes the market.
