Deals
iPhone deals
Samsung Galaxy deals
Gift Ideas
Business employee
55+
Military
First responders
Nurses & physicians
Teachers
Union
Credit card
&More Benefits
Explore wireless
Plans & prices
Phones & devices
Upgrade
Bring your own
Add a Line
Switch and save
Trade in your device
International options
Shop new iPhones
iPhone 16
Samsung Galaxy S25
Why AT&T Wireless
Wireless help
More resources
Explore Internet
Plans & prices
Fiber
All-Fi (Wi-Fi)
Check availability
AT&T Internet Air
Moving services
Bundles
Gaming
Home business
Internet help
Internet Speed Test
More resources
Access from AT&T
Explore DIRECTV
TV bundles
DIRECTV help
U-verse help
Explore AT&T PREPAID
Prepaid plans
Phones
Bring your own phone
Prepaid deals
Prepaid account
Activate your service
Lease-to-Own
Home Phone Services
AT&T Phone
AT&T Phone – Advanced
Landline Phone
Lifeline
Phones & accessories
Digital phone help
Landline phone help
Bundles
Internet + DIRECTV
Internet + Wireless
Internet + Phone
Home office
Smart watches & devices
Smart home
In-car Wi-Fi
All accessories
Headphones
Cases
Chargers
Screen protectors
Speakers & smart home
Internet & TV equipment
PopSockets & more
Gadgets & gaming
Accessory deals

What is an IMEI number and how is it used?

Learn more about what an IMEI number is, what it’s used for, and how to identify your phone's IMEI number.

What is an IMEI number?

The IMEI number is an essential feature of every mobile device—it's a unique identifier that plays a critical role in various aspects of your phone's functionality and security.

So, what does IMEI stand for? IMEI is the acronym for International Mobile Equipment Identity. As its name suggests, it's an identifier that distinguishes each mobile device across the globe. It consists of 15- to 17-digit numbers and is unique to each device. And, just like fingerprints that are unique for each person and used to identify that person, the IMEI is used to identify valid devices and can be used to stop a stolen phone from accessing a network.

woman looking at her mobile and smiling

What types of phones have IMEI numbers? 

All types of mobile phones, including smartphones, have an IMEI number. However, this number isn't limited to mobile phones; other mobile devices like tablets and smartwatches also have an IMEI number. You can easily check the IMEI number in iPhone or any other device using a few simple steps, as explained in this article.

How do I find my mobile phone's IMEI number?

You’ll be happy to hear that it’s simple and free to check your mobile phone’s IMEI number. For most mobile phones, you can look up the IMEI number by dialing *#06# on your mobile phone, and your IMEI number will be displayed on the screen. The number is also listed in your mobile phone settings. If you're an iPhone user, head to the About section in Settings. If you're an Android user, you can find it under Settings > About Phone > Status.  

How do I check my mobile phone's compatibility with a new carrier?

If you're planning to switch carriers and want to bring your own device, you can use your IMEI number to check your mobile phone's compatibility. Most carriers provide an IMEI unlock checker tool on their website. All you need to do is enter your IMEI number to check if your mobile phone is compatible with the new carrier. Remember that if the mobile phone is incompatible, you'll need to buy a new mobile phone and perhaps also do a trade-in for your old mobile phone.

How do I report a lost or stolen phone?

If you lose your phone or it gets stolen, you can use your IMEI number to report it to your carrier and the police. Your carrier can block the device from being used on their network using the IMEI number, rendering it useless for the thief.

More articles and information

author-bio-panel-img
Author

Tamar Levin

Tamar Levin is a Sr. Digital Content Editor at AT&T, who specializes in wireless technology and innovation. With dual Master of Science degrees from the University College London, Tamar brings over a decade of editorial expertise to her role. She currently spearheads the Content Standards Council at AT&T. Tamar is based out of Dallas, Texas.