What an IMEI tells you about an iPhone's lock status

An IMEI (International Mobile Equipment Identity) is a 15-digit number unique to every phone. It identifies the device itself, separate from the SIM card or phone number. You can use it to check whether an iPhone is locked to a specific carrier, reported stolen, or blacklisted — but the IMEI alone does not directly reveal lock status. Instead, you use the IMEI to look up the phone's history through carrier databases or third-party checkers that have access to that data.

The lock status matters because a locked iPhone will only work with one carrier's SIM card. An unlocked iPhone works with any carrier. If you are buying a used iPhone or received one as a gift, knowing the lock status before you set up it saves you from discovering later that you cannot use it with your preferred carrier.

Key Takeaways

  • Find your iPhone's IMEI by dialing *#06# or checking Settings > General > About, then scrolling to IMEI.
  • Apple's official check at apple.com/support requires you to enter the IMEI and answer security questions tied to the original account.
  • Carrier-specific checks through AT&T, Verizon, T-Mobile, or Sprint websites verify lock status directly but only if you have account access or the device's history.
  • Third-party IMEI checkers can show carrier information and blacklist status, but they cannot definitively confirm lock status without carrier verification.
  • A locked iPhone locked to a carrier you do not use is essentially unusable until you contact that carrier or the original owner to unlock it.

Finding your iPhone's IMEI number

The IMEI is printed on the physical SIM tray inside the phone, but the easiest way to find it without opening the phone is through the Settings app. Open Settings, tap General, then tap About. Scroll down until you see the IMEI field — it is a 15-digit number. Write it down or take a screenshot.

If the phone is powered off or you cannot access Settings, you can also dial *#06# on any iPhone. The IMEI appears on the screen when ready. This works even if the phone is locked to a carrier, because it is a built-in function that does not require a SIM card or network connection.

Checking lock status through Apple's official channel

Apple's support website at apple.com/support has a tool to check whether an iPhone is locked or unlocked. Enter the IMEI, then answer security questions about the device — usually the original purchase date, the country where it was bought, and the original owner's name or email. If you are the original owner or have that information, this is the most reliable method.

Apple's tool shows whether the device is locked to a carrier, locked to an Apple ID (set up Lock), or unlocked. It also flags if the phone has been reported lost or stolen. If the phone is locked to a carrier, the tool tells you which one. If it is locked to an Apple ID, you will need the original owner's credentials to remove that lock before the phone is fully usable.

Checking lock status directly with carriers

Each major carrier — AT&T, Verizon, T-Mobile, and Sprint (now part of T-Mobile) — has its own database of locked and unlocked devices. You can contact the carrier directly with the IMEI to ask about lock status. Some carriers allow you to check online if you have an account with them and the device is registered to that account.

AT&T's unlock tool is at att.com/deviceunlock. Verizon's is at verizon.com/about/consumer-protections/device-unlocking. T-Mobile's is at t-mobile.com/account/device-unlock. These tools typically require you to log into an account or provide proof of purchase. If you are checking a phone you do not own, you will not have account access, so this route works best if you are the original buyer or the current account holder.

If the phone was purchased from a carrier but the account has been closed or transferred, calling the carrier directly with the IMEI is often faster than the online tool. Have the IMEI ready and explain that you are checking the lock status of a device you own or are considering buying.

Using third-party IMEI checkers

Websites like IMEI.info, CheckMEID.com, and similar services let you enter an IMEI and see information about the phone — the model, carrier, and sometimes whether it is blacklisted or reported stolen. These sites pull data from public databases and carrier partnerships, but they do not always have real-time access to lock status.

Third-party checkers are useful for confirming the phone model matches what the seller claims and for checking if the device is blacklisted. However, they should not be your only source for lock status. Many of these sites also charge a fee for detailed reports. If you use one, cross-check the results with Apple's official tool or the carrier's own database before making a purchase decision.

What to do if the iPhone is locked to a carrier you do not use

If the IMEI check shows the phone is locked to AT&T but you use Verizon, the phone will not work with a Verizon SIM card. You have two options: contact the original carrier and ask them to unlock it, or contact the original owner and ask them to request an unlock from their carrier.

Most carriers will unlock a phone if the account associated with it is in good standing and the device has been active on that account for a set period — usually 40 to 60 days. If the account is closed or the device was never activated, the carrier may still unlock it, but you will need to provide proof of ownership or have the original owner make the request. Some carriers charge a fee for unlocks, though many have stopped charging as of recent years.

If you cannot reach the original owner or the carrier refuses to unlock, you may be able to use the phone on the original carrier's network. If that is not an option for you, the phone is not usable, and you should not complete the purchase.

Checking for set up Lock and other restrictions

Beyond carrier lock, an iPhone can also be locked to an Apple ID through set up Lock. This is a security feature that prevents anyone but the original owner from using the phone. If the IMEI check or the phone itself shows set up Lock is enabled, you will need the original owner's Apple ID and password to remove it before you can set up the phone with your own account.

set up Lock is separate from carrier lock. A phone can be unlocked from the carrier but still locked to an Apple ID, or vice versa. Always check both before buying a used iPhone. If the seller cannot provide the Apple ID credentials or refuses to remove the lock, do not buy the phone — you will not be able to use it.

Frequently Asked Questions

Can I check an iPhone's lock status if it is powered off?

You can find the IMEI by dialing *#06# even if the phone is off, but you cannot access Settings to check it that way. Once you have the IMEI, you can use it to check lock status through Apple's website or the carrier's database without the phone being powered on.

Does an unlocked iPhone work with every carrier?

An unlocked iPhone works with any carrier that uses the same network technology. Most modern iPhones support both GSM (AT&T, T-Mobile) and CDMA (Verizon, Sprint) networks, so an unlocked phone will work with any major US carrier. However, some older iPhones or international models may not support all network bands, so check the phone's technical specs against your carrier's requirements.

What does it mean if the IMEI checker says the phone is blacklisted?

A blacklisted IMEI means the phone was reported stolen, lost, or involved in fraud. Carriers will not set up a blacklisted phone on their network, even if it is unlocked. Do not buy a phone with a blacklisted IMEI — you will not be able to use it, and you may be in possession of stolen property.

Can I unlock an iPhone myself if it is locked to a carrier?

No. Only the carrier that locked the phone can unlock it, or the original owner can request an unlock from the carrier. There is no software method to bypass carrier locks on modern iPhones. If a seller claims they can unlock it for you, they are either lying or offering an illegal service.

How long does it take for a carrier to unlock an iPhone?

Most carriers process unlock requests within 24 to 48 hours. Some do it when ready online if you meet their requirements. If you are buying a used phone and the seller agrees to request an unlock, ask them to do it before you complete the purchase and confirm the unlock is complete before handing over payment.