iPhone 'Unknown Part' Display Message Explained (Is It a Problem?)

The iPhone “Unknown Part” (or “important display message”) is an informational notice that appears when the screen wasn't installed by Apple — it does not stop your phone working or mean the screen is faulty. Here's exactly what it means and what to expect.

What is the 'Unknown Part' message?

Direct answer: from iPhone 11 onward, iOS detects when a display wasn't paired by Apple and shows a one-time notice on the lock screen for a few days, then logs it under Settings > General > About as “Unknown Part”. It appears with any non-Apple-installed screen — including a genuine Apple panel fitted by a third party — because it reflects the pairing, not the part's quality.

Does it cause any problems?

• The phone works normally — display, touch and brightness are unaffected.
• On some older models (iPhone 11–14) a non-paired screen could also disable True Tone and, briefly, auto-brightness — see our True Tone after replacement guide.
• It is a notice, not a fault — it won't slow the phone or block updates.

Can you remove the 'Unknown Part' notice?

The lock-screen banner clears itself after a few days; the entry under Settings stays as a record. A repair shop can program a compatible screen to reduce or avoid warnings on many models, but it's optional — nothing about the message harms the phone.

Choosing a replacement screen? Our iPhone screen grades guide explains the options and what to expect from each.

Why buy your iPhone screen from Supreme Phone Parts?

• UK stock, dispatched from the UK — no long overseas waits.
• eBay Top Rated seller — trusted by UK repairers and repair shops.
• Trade & bulk pricing available for repair businesses.

Frequently asked questions

Is the iPhone 'Unknown Part' message a problem?

No — it's an informational notice that the screen wasn't installed by Apple. The phone works normally and the message doesn't mean the part is faulty.

Why do I get a non-genuine display message after a screen replacement?

iOS detects when a display wasn't paired by Apple and shows the notice. It appears with any non-Apple-installed screen, even a genuine panel fitted elsewhere.

Can the 'Unknown Part' message be removed?

The lock-screen banner clears after a few days; the Settings entry remains. A shop can program compatible screens to reduce warnings on many models, but it's optional.