The clock is running on your iPhone 15 Pro or 16 Pro's value
The iPhone 18 Pro has a firm on-sale date. Refurbished iPhone buyers and sellers both need to understand what that means for used Pro model prices right now — because the window to get the best money for yours is measured in weeks, not months.
Bloomberg's Mark Gurman has pointed to a keynote on Tuesday, 8 September as the most likely date, with Wednesday, 9 September as a runner-up. On the release side, there is broad agreement: the iPhone 18 Pro and Pro Max go on sale on Friday, 18 September 2026. That is less than two months away.
What makes the iPhone 18 Pro a genuine upgrade — and why that matters for your resale
The reason this launch hits resale values harder than some cycles is the spec jump. The iPhone 18 Pro is expected to be the first iPhone with a mechanical variable-aperture main camera — a lens that physically opens and closes to control light and depth of field, something no previous iPhone has shipped with. Paired with that is Apple's A20 Pro chip, built on TSMC's 2nm process, which rumours suggest delivers around 15% faster speeds and 30% better power efficiency than current models.
Those are hardware changes that buyers can feel in day-to-day use. When an upgrade is this tangible, demand for the outgoing generation softens more sharply — and that is reflected directly in what the second-hand market will pay for your iPhone 15 Pro or 16 Pro once the new one is announced.
Apple's split launch makes this cycle especially time-sensitive
There is one more factor working against sellers who wait. Apple is not releasing a full lineup in September. The standard iPhone 18 and the more affordable iPhone 18e are not part of the autumn 2026 launch at all — they are expected in spring 2027. That means the iPhone 18 Pro, Pro Max and the rumoured foldable model will absorb all of the media attention, all of the upgrade desire, and all of the trade-in activity this autumn.
When everyone with a Pro model decides to sell at once — and they will — supply floods the used market. Prices follow supply downward. The sellers who acted before that wave are the ones who got the better price.
When should I sell my iPhone before the new one comes out?
The ideal window is four to six weeks before the announcement — which, for September 2026, means now through mid-August. After the keynote, two things happen almost simultaneously: Apple cuts the official price of the previous generation, and thousands of sellers list their old Pro models at once. Both events push used prices down. Research into previous launch cycles shows that search interest for "iPhone price drop after release" peaks sharply in August and September each year, which tells you the market is well aware of the dynamic and reacts quickly.
The steepest single depreciation event is the moment the new model is announced, not when it ships. Buyers who want a 15 Pro or 16 Pro stop waiting and start bidding down — because the newer alternative just became real. Selling before the keynote keeps you ahead of that move.
Is it worth selling my iPhone 16 Pro now, or waiting?
Waiting is a bet that values hold steady, and the evidence suggests they will not. The iPhone 16 Pro launched in September 2024 at £929 for the base 128GB model. By March 2026 UK trade-in comparison data showed 128GB models in good condition fetching in the £750–790 range — already well off the launch price with further slippage expected as the 18 Pro launch approaches. After the 18 Pro goes on sale, Apple will officially reduce the price of remaining iPhone 16 Pro stock, which sets a new ceiling for what the second-hand market will tolerate.
For iPhone 15 Pro owners the picture is similar. The 15 Pro was a well-built phone — titanium chassis, A17 Pro chip, ProMotion display — but it does not support Apple Intelligence, and the iPhone 18 Pro's camera upgrade makes the gap more visible than it was a year ago. That combination tends to accelerate the depreciation curve in the final weeks before a launch.
What happens to prices the day Apple announces?
Depreciation on used iPhones accelerates fastest between announcement and launch — not after. The moment the new Pro models are confirmed on stage, buyers shift attention and sellers pile in. That spike in supply with softening demand is where value drops most sharply in a short period. Every previous iPhone launch cycle has followed this pattern. The sellers who avoided that cliff sold in late July or August.
- Sell before the keynote (now–mid August): best chance of peak pre-launch value
- Sell after the keynote but before on-sale (9–17 September): values already softening, but not collapsed
- Sell after 18 September: competing with a market flooded by upgraders; values typically down 20–30% from the pre-announcement high
How Tech4Cash buys your iPhone — no Post Office queue required
If you are in the North East or Manchester, Tech4Cash collects from your doorstep. No trips to a drop-off point, no waiting for a postage label. We verify devices using PhoneCheck diagnostics and pay instantly — not store credit, not a bill deduction, actual money.
Every device we buy is professionally refurbished and resold with a warranty, so the phone you sell us ends up in someone else's hands rather than a landfill. If you have been sitting on a 15 Pro or 16 Pro wondering whether to bother, the timing right now is about as clean as it gets.
Get a quote and arrange doorstep collection at Sell My Phone. Or if you want to see what a professionally refurbished Pro model looks like on the other side of the transaction, browse our refurbished iPhone collection — useful if you are planning to trade down and pocket the difference rather than going straight to the 18 Pro at launch.
Either way, the move that makes financial sense is the one you make before 8 September.
