The fastest way: Settings on your iPhone

Open Settings on your iPhone, then tap General. Scroll down and tap About. Your serial number appears on the screen as a string of letters and numbers — it looks something like "F2RM4XXXXXXXXXX". You can tap it to copy it to your clipboard, then paste it into an email or document.

This method works on any iPhone running iOS 10.2 or later. The serial number stays the same throughout the phone's life, so if you need it months or years from now, it will be exactly what you see today.

Key Takeaways

  • Your serial number is in Settings > General > About, where you can tap it to copy it when ready.
  • The physical serial number is printed on the back of your iPhone below the camera, though it may be hard to read on newer models.
  • You can also find your serial number on the original box your iPhone came in, printed on a label on the back.
  • Apple Support and your carrier both use the serial number to look up warranty status and service history.

Finding the serial number printed on your iPhone

Turn your iPhone over and look at the back, below the camera. The serial number is printed there in small text. On older iPhones (iPhone 6s and earlier), it is usually straightforward to read. On newer models with larger cameras or camera arrays, the text is smaller and may be harder to see without bright light or a magnifying glass.

If the printed number is worn away or unreadable, the version in Settings is your reliable backup. Apple's systems recognize both equally, so either one works for warranty checks or repairs.

Checking the original box and receipt

If you still have the box your iPhone came in, the serial number is printed on a label on the back. It appears alongside the model number, capacity, and color. Your original receipt or invoice from the carrier or retailer may also list the serial number, though not always.

These sources are useful if your phone is damaged or won't turn on, since you can still prove ownership and warranty status without accessing Settings.

What the serial number tells you

The serial number is a unique identifier — no two iPhones have the same one. It is different from your IMEI (a number used by carriers) and your UDID (a number used by developers). When you contact Apple Support or your carrier, they use the serial number to pull up your device's warranty coverage, service history, and whether it has been reported as lost or stolen.

You may also need the serial number if you are selling your iPhone, trading it in, or sending it for repair. Always keep a record of it in a safe place, separate from the phone itself.

Finding the serial number on a locked or disabled iPhone

If your iPhone is locked, disabled, or won't turn on, you cannot reach Settings. In this case, the printed serial number on the back of the device is your only option. If that is also unreadable or missing, the original box or your carrier's account records are the next place to look.

If you are locked out of an iPhone you own and need the serial number for a repair or warranty claim, contact Apple Support directly with proof of purchase. They can look up the serial number using your account or receipt.

Difference between serial number and other device identifiers

Your iPhone has several numbers that identify it, and they serve different purposes. The serial number is what Apple uses. The IMEI (International Mobile Equipment Identity) is what your carrier uses to connect you to their network. The ICCID is the SIM card's identifier. For most purposes — warranty, support, repairs — you need the serial number, not the others.

If you are unsure which number you need, tell the person or organization asking what you are trying to do. They will tell you which one to provide.

Frequently Asked Questions

Can I find my serial number if my iPhone is turned off?

No — you cannot reach Settings without turning the phone on. Use the printed serial number on the back of the device, or check the original box or your carrier's account instead.

Is the serial number the same as the phone number?

No. Your phone number is assigned by your carrier and can change if you switch carriers or plans. Your serial number is permanent and unique to the physical device itself.

What if the serial number on the back does not match the one in Settings?

This should not happen. If the numbers do not match, the phone may have been repaired with a replacement back panel. Contact Apple Support with both numbers and proof of purchase to clarify the device's history.

Do I need my serial number to set up a new iPhone?

No. You can set up a new iPhone using your Apple ID and password. You only need the serial number if you are registering the device for warranty coverage, contacting support, or trading in your old phone.

Where do I find the serial number on an iPhone I am buying used?

Ask the seller to show you Settings > General > About on the device itself, or ask them to provide a photo of the back of the phone showing the printed serial number. This confirms the serial number matches the device you are about to buy.