OEM vs Aftermarket vs Genuine Phone Parts: The Honest Buyer's Guide (2026)

Search for a phone screen or battery repair and you'll hit a wall of jargon: genuine, OEM, aftermarket, soft OLED, incell, refurbished, compatible. Most repairers either hide behind these words or never mention them – you hand the phone over, pay a price, and never find out what part went in. That is exactly how a £30 screen and a £150 screen end up looking identical in an online advert.

This guide cuts through the terminology honestly: it defines every term in plain English, explains what genuinely differs between a top-grade part and a bargain one, and shows you the right questions to ask any repairer. At celltech we publish a standard and a premium tier for every model precisely so the decision is yours to make – not a guess made for you behind a counter.

Direct answer: "Genuine" (or OEM) parts are made by, or to the specification of, the original manufacturer; "aftermarket" parts are third-party alternatives ranging from excellent high-grade OLED panels down to cheap bargain copies; and "refurbished" (or "pulled original") parts are genuine components reconditioned from another device. For a screen, the three things that actually differ are colour and brightness, touch quality (including 120Hz ProMotion on Pro models), and how long the panel lasts. A quality aftermarket panel is excellent value for everyday use; a genuine-grade panel is the closest match to the original; and the cheapest screens are a false economy – dimmer, prone to ghost touch, and quicker to fail.

Genuine, OEM, Aftermarket, Refurbished – What the Words Actually Mean

These four words get used loosely – sometimes deliberately so. Here is what each really means.

Genuine and OEM-grade

A genuine part is made by the original manufacturer for that exact device – the same display or battery an official service centre would fit. OEM ("original equipment manufacturer") means a part from the same supplier that produced the original: Apple, for instance, does not make its own iPhone OLED panels – they come from makers like Samsung Display and LG – so an OEM-grade panel comes off that same kind of line, built to original specification.

In the trade the two terms are used interchangeably, and the line between them is genuinely blurry. The honest takeaway: both describe a part built to original specification – the colour, brightness, touch behaviour and longevity the device was designed around. They sit at the top of the quality ladder, and cost the most.

Aftermarket – And Why It Is Not One Thing

"Aftermarket" simply means a part made by a third party rather than the original manufacturer. The point most adverts hide is that aftermarket is not a single grade – it is a wide ladder, and where a part sits on it matters far more than the word itself:

• High-grade "soft" OLED – flexible OLED panels that closely mirror the original in colour, brightness and contrast. The best aftermarket option, and what a reputable repairer means by a quality screen. (Cheaper rigid "hard" OLED is a step down – often good, but can differ in viewing angle and brightness.)
• Incell and compatible LCD – for older LCD-era phones (iPhone 7, 8, XR, SE), a quality incell panel fuses the touch and display layers like the original and performs excellently for everyday use.
• Bargain panels – the bottom of the ladder: dim, washed-out, laggy to the touch and quick to fault. These are behind most "my phone feels wrong since the repair" complaints.

When two repairers quote wildly different prices for "an aftermarket screen," this ladder is almost always why – the word is the same; the part is not.

Refurbished and "Pulled Original"

A refurbished (or "pulled original") screen is a genuine factory panel recovered from another device and reconditioned – typically by bonding fresh outer glass to the original display. You get genuine panel quality (true original colour, brightness and, on Pro models, ProMotion) for less than a brand-new genuine part. A good refurbished panel is an excellent middle ground; a poorly re-glassed one is not – so the quality of the refurbisher matters as much as the label.

Screens: Where the Quality Difference Shows Up Most

Screens are where parts quality is most visible – literally. You look at the display all day, so any compromise is one you live with. Here is what changes between grades:

• Colour and brightness – genuine-grade panels match the original's colour temperature and peak brightness; lower-grade panels can look cooler, dimmer or washed out, and struggle in sunlight.
• Touch quality – a good panel tracks your finger precisely. Cheap digitisers introduce lag, missed taps, or the dreaded ghost touch, where the phone registers presses you never made.
• True Tone – the ambient-light feature that warms the display to your surroundings. A proper repair reprograms it onto the new panel; the cheapest screens often lose it.
• ProMotion (120Hz) – on iPhone Pro models from the 13 Pro onwards, the original uses an adaptive 120Hz LTPO panel. Many aftermarket panels run at 60Hz; only a genuine-grade panel fully restores the 120Hz feel.
• Longevity – the difference you cannot see on day one. Quality panels hold brightness and touch accuracy for years; bargain panels can dim, develop dead zones or delaminate within months.

The trade-off, plainly: a genuine-grade panel is the closest match to the original but costs more; a high-grade aftermarket panel saves you money and, for most people on a non-Pro phone at 60Hz anyway, the everyday difference is small. The mistake is not choosing aftermarket – it is being sold the cheapest possible panel without being told that is what you are getting.

celltech's Two Published Screen Tiers (Real Prices)

Rather than quoting a single take-it-or-leave-it price, we publish two defined tiers per model. Standard is a high-quality compatible panel (a soft OLED, or a quality incell panel on older LCD iPhones). Premium is a genuine-grade panel – OEM-grade or a refurbished original – visually indistinguishable from the factory display and, on Pro models, fully restoring ProMotion.

Notice how the gap between tiers widens on the Pro and Pro Max models – that is ProMotion at work. A genuine-grade 120Hz LTPO panel is one of the most expensive parts in the catalogue, which is why the iPhone 13 Pro Max jumps from £114.95 to £299.95 while the non-Pro iPhone 13 moves only from £74.95 to £149.95. For every model in both tiers, see our iPhone screen replacement cost guide, and for Android our Samsung screen replacement cost guide.

Why the Cheapest Screen Is a False Economy

The lowest-priced panels are cheap for reasons you only discover after the repair. They are the leading cause of ghost touch – where the phone taps and types by itself – and they tend to be dimmer, harder to read outdoors, laggy to the touch, and missing features like True Tone and ProMotion. Worst of all, they often fail within months, which means paying twice – and if the repairer offered only a token 30- or 90-day warranty, you may not even be covered. A screen that costs half as much but lasts a fifth as long was never the cheaper option, which is why the warranty behind a part matters as much as the part itself.

Batteries: Cell Quality, Capacity, Safety and Cycle Life

Batteries follow the same ladder as screens, but the stakes differ: a battery is a chemical cell sealed inside the device. Here the quality difference is about safety and lifespan rather than colour and touch:

• Capacity honesty – quality cells deliver their stated milliamp-hours. The cheapest cells routinely overstate capacity, so a "bigger" bargain battery can hold less charge than a genuine-grade one.
• Cycle life – a good cell holds most of its capacity across hundreds of charges; a poor one degrades fast, so within months you are back to the short battery life you paid to fix.
• Safety – the one that matters most. Reputable cells use quality chemistry and protection circuitry and pass recognised safety standards. The cheapest cells carry a real risk of swelling, which can push the screen off the phone.

As with screens, we publish a standard and a premium battery per model: the standard cell matches the original's capacity and safety standards, the premium is a top-grade option for maximum longevity. For an iPhone 13 it is £44.95 or £69.95; an iPhone 14, £69.95 or £89.95; an iPhone 15, £74.95 or £94.95 (full list in our iPhone battery replacement cost guide). A battery is the one part to never buy on price alone – the saving is small and the risk is not.

celltech's Honest, Tiered Approach

Our model is built around removing the guesswork the rest of the trade relies on:

• Transparent published pricing – every model, both tiers, listed online. No "from" estimates and no quote-wall where you hand the phone over before learning the price.
• A genuinely long guarantee – standard screen and battery replacements carry a 27-month warranty, more than double the 12 months most independent UK repairers offer and far longer than the 90 days on an out-of-warranty Apple repair. We would not stand behind aftermarket parts for over two years if they were not quality parts.
• Free diagnostics on standard repairs, so you know what is wrong before you commit.
• UK-wide, tracked and insured mail-in, both ways – you post your device, we repair and fully test it, and send it back. The same prices and tiers apply wherever in the UK you are, not just near a high-street shop.

We cover around 2,467 device models and hold a 4.8-star rating. We are not the cheapest on every flagship – a bargain-panel seller will always undercut a quality one. What we offer instead is knowing exactly what you are paying for, and standing behind it for 27 months.

How to Ask a Repairer the Right Questions

Whoever you choose, these five questions reveal almost everything about the repair you are buying. A confident, honest repairer answers them all without hesitation.

• "What grade of part are you fitting – genuine, OEM-grade, aftermarket or refurbished?" If they cannot or will not say, that is your answer.
• "On a Pro model: will I keep 120Hz ProMotion and True Tone?" This quickly separates genuine-grade panels from cheaper 60Hz ones.
• "How long is the warranty, and what does it cover?" A 30- or 90-day warranty tells you how much confidence the repairer has in the part.
• "Is the price published, or only after you have my phone?" Transparent pricing is a strong signal; quote-walls are not.
• "For a battery: does it meet recognised safety standards, and what capacity is it?" You want a specific answer, never a shrug.

Frequently Asked Questions

What is the difference between OEM and genuine parts?

In practice the two overlap heavily. "Genuine" means a part made by the original manufacturer for that exact device; "OEM" means one made by the same supplier that produced the original component, to the same specification. Both sit at the top of the quality ladder and cost more than aftermarket alternatives.

Are aftermarket phone screens any good?

The best ones are excellent and the worst are awful – "aftermarket" is a ladder, not a single grade. A high-quality soft OLED panel is very close to the original, and most people on a non-Pro phone would not notice the difference; the cheapest bargain panels are dim, prone to ghost touch and quick to fail. The word tells you little; the grade within it tells you everything.

Will an aftermarket screen keep True Tone and 120Hz ProMotion?

True Tone is usually preserved on a quality repair, as it is reprogrammed onto the new panel; the cheapest screens often lose it. ProMotion (the 120Hz rate on iPhone Pro models from the 13 Pro onwards) is different – many aftermarket panels run at 60Hz, and only a genuine-grade panel fully restores the original 120Hz feel.

Is it worth paying extra for a genuine-grade screen?

It depends on the phone. On a Pro or Pro Max, the premium tier restores 120Hz ProMotion and the exact original look. On a non-Pro model running at 60Hz anyway, the standard panel is excellent value and the upgrade is subtle. What is almost never worth it is the cheapest panel below either tier. Our screen cost guide lists both tiers for every model.

Does using aftermarket parts void my warranty?

Under UK consumer law, a third-party repair does not automatically void a manufacturer's warranty – they can only decline cover if they can show the repair caused the specific fault. Separately, the repair itself should carry its own warranty: at celltech, standard screen and battery replacements come with a 27-month guarantee – far longer than Apple's 90 days, and more than double the 12 months most independent UK repairers offer.

Is my data safe during a screen or battery replacement?

Yes. A screen or battery swap is a mechanical job that does not require wiping the phone, so your data stays put – we do not touch your files, and your device comes back set up just as you sent it, posted with tracked, insured delivery.

How do I know which part a repairer is actually fitting?

Ask directly and judge the answer. A reputable repairer will name the grade of part, confirm whether ProMotion and True Tone are retained, and state the warranty length and price up front. Vagueness on any of these – or a refusal to quote until your phone is in their hands – is the clearest warning sign there is. We publish both tiers and prices for exactly that reason: book your repair and you will always know what is going into your phone.