The iPhone 18 Pro goes on sale on 18 September 2026. That date matters even if you have zero interest in buying one — because it resets the entire refurbished iPhone market overnight. Right now, eight weeks out, you're in the best window of the year to buy a refurbished iPhone 15 or 16. Prices are near their floor for this cycle. After September, a wave of trade-ins floods the market and values on older models drop further still — but stock of well-graded units also gets patchier as sellers hold back ahead of the rush.
So: which generation should you actually buy? Here's a straight comparison across the three generations currently available as refurbished stock in the UK.
What's actually different between the iPhone 15, 16 and 17?
Before talking money, it helps to know what you're gaining or giving up at each tier.
iPhone 15 — launched September 2023. The headline upgrade over the 14 was USB-C (finally replacing Lightning) and the Dynamic Island notch design coming to the standard model. It runs Apple's A16 Bionic chip with a 6.1-inch Super Retina XDR display and up to 2,000 nits peak outdoor brightness. It's a solid daily phone. The catch: the iPhone 15 has 6GB of RAM versus 8GB on the iPhone 16, and that RAM difference is the key reason the iPhone 15 does not support Apple Intelligence. It will receive iOS updates until at least 2028, but Apple's AI feature set is locked out entirely.
iPhone 16 — launched September 2024. It brought a more powerful chip, a new Action Button, a dedicated Camera Control, and improved battery life. Both the 15 and 16 share a 6.1-inch OLED Super Retina XDR display with the same resolution. The meaningful additions are Apple Intelligence support, the physical Camera Control button on the side, and noticeably better benchmark performance from the A18 chip. The iPhone 16 is promised software updates until at least 2029.
iPhone 17 — launched September 2025. The 17 delivers a 120Hz ProMotion display, an upgraded 18MP selfie sensor with Centre Stage, faster silicon, and Apple Intelligence enhancements. The display also steps up to 6.3 inches, slightly larger than the 6.1-inch screen on the 15 and 16. It's the newest generation available as refurbished stock, but — crucially — it's the one that's barely had time to depreciate.
What does the refurbished price gap actually look like?
In July 2026, refurbished iPhone 15 prices on the open market start from around £324, with well-graded units from reputable UK sellers typically sitting higher depending on storage and condition. Apple's own certified refurbished iPhone 16 is currently listed from £589, and third-party refurbishers in the UK are offering it below that depending on grade. The iPhone 17, meanwhile, is available new from around £680 on UK price comparison sites — meaning the refurbished discount at this stage of its life is slim. When a phone is only ten months old, the market hasn't fully priced in the depreciation yet. Expect the iPhone 17's refurbished gap to widen significantly once September trade-ins arrive.
In practical terms: the iPhone 15 offers the deepest discount off original retail. The iPhone 16 sits in the middle — enough of a saving to make sense, with Apple Intelligence included. The iPhone 17 refurb premium is still close enough to new pricing that you're not getting the return on value that refurbished buying is supposed to deliver.
Is a refurbished iPhone 15 still worth buying in 2026?
Yes — if Apple Intelligence isn't on your list. Powered by the A16 Bionic and fully compatible with the current iOS, it's a capable daily smartphone, and if you're upgrading from an iPhone 12 or older, the difference will feel significant. The big practical upgrade for anyone coming from an older Lightning iPhone is USB-C — that means less cable chaos and compatibility with the modern accessories most people already own.
Where it falls short: Apple Intelligence — the suite of on-device AI tools covering writing assistance, image generation, a smarter Siri and more — lands on iPhone 16 and iPhone 15 Pro models, not on the standard iPhone 15. That's a hardware limitation, not a software one. It won't be patched in. If you're buying a phone you plan to use for three or four years, that gap will only become more noticeable as Apple Intelligence features expand.
The verdict: the iPhone 15 makes most sense for buyers who primarily want a reliable, modern iPhone at the lowest possible entry point and have no interest in AI features. For that use case, the value is genuinely strong right now.
Should I buy a refurbished iPhone 16, or wait for iPhone 18?
Buy the 16. Here's why waiting doesn't add up.
The iPhone 18 Pro event is expected on Wednesday 9 September, with pre-orders opening 11 September and the phones hitting stores on Friday 18 September. That's nine weeks away. In those nine weeks, you're using whatever phone you're on now. Then, when the 18 Pro launches, you're looking at prices starting well above £1,000 for a new Pro model — every new iPhone announced in September 2026 is likely to start at £999 or more.
A refurbished iPhone 16, graded properly by a specialist refurbisher, gives you Apple Intelligence, the Action Button (previously exclusive to the 15 Pro) with full customisation — camera, torch, Shortcuts and more — and a chipset that will receive software support until at least 2029. The iPhone 18 Pro's headline upgrades are Apple's first 2nm chip and camera improvements — meaningful for power users, but not the kind of step change that makes a well-priced refurbished iPhone 16 look obsolete.
The one scenario where waiting makes sense: if you specifically want an iPhone 18 Pro for the new camera hardware or 2nm chip performance gains, and you're happy to pay new-device prices. For everyone else, the refurbished iPhone 16 is the rational call.
What is the best refurbished iPhone for the money in the UK right now?
For most buyers: the refurbished iPhone 16. It's the sweet spot — enough of a saving over new to justify going refurbished, Apple Intelligence included, hardware that's genuinely current, and a software support window that stretches well into the decade. The iPhone 15 is a strong runner-up if budget is the overriding factor. The iPhone 17 refurbished doesn't yet offer the value differential that makes refurbished buying worthwhile.
When you're comparing listings, a few things matter more than the headline price:
- Grading transparency — check that the seller defines what each condition grade means. "Good" at one retailer may be "Fair" at another.
- Battery health — look for a stated minimum, ideally 80% or above. A vague "tested" is not the same as a declared health percentage.
- Verification — reputable UK refurbishers run devices through diagnostic tools (PhoneCheck is one of the industry standards) to confirm IMEI status, hardware function and battery health before grading.
- Warranty — a minimum of 12 months from a specialist is the baseline. Avoid any listing with no stated after-sales cover.
- SIM-free — always buy unlocked. Carrier-locked refurbished stock is a headache you don't need.
The September reset: what happens to prices after the iPhone 18 Pro launch?
Every September, Apple's launch event triggers a predictable chain reaction in the refurbished market. New iPhone buyers trade in their current handsets, a wave of iPhone 16s and 17s hits the secondary market, and prices on older models soften. For buyers, that means refurbished iPhone 16 prices will likely ease further in October and November. For sellers, it means now — before that wave — is typically the better time to get a quote for your current device. Values on iPhone 15s and 16s in good condition are as strong as they'll be for the next twelve months.
If you're currently sitting on a working iPhone 14, 15, or 16 and planning to upgrade, it's worth getting a valuation before the trade-in market floods. The difference between selling in August versus November can be meaningful.
Where to go from here
Tech4Cash stocks refurbished iPhones across all three generations — graded, verified with PhoneCheck, and sold with warranty. If you want to compare what's actually in stock right now, browse our full refurbished iPhone range and filter by model and condition.
If you've got an iPhone you're ready to move on, you can get an instant quote to sell your phone to us — we collect from your door across the North East and Manchester, and pay on the spot. Worth doing before September resets what your device is worth.
Not sure how we grade our stock? See our full condition guide so you know exactly what you're buying before it arrives.
