People often confuse IMEI numbers and serial numbers — and it is easy to see why. Both are unique identifiers printed on your phone. But they serve very different purposes and are used in completely different situations.
Quick answer: Your IMEI identifies your device on mobile networks globally. Your serial number identifies your device to the manufacturer for warranty and support purposes.
Side by side comparison
| Feature | IMEI | Serial Number |
|---|---|---|
| Length | Always 15 digits | Varies by manufacturer |
| Format | Numbers only | Letters and numbers |
| Scope | Globally unique across all devices | Unique within manufacturer only |
| Managed by | GSMA (international body) | Manufacturer |
| Used for | Network identification, blacklists, theft reporting | Warranty, repairs, support |
| Tablets/Wi-Fi only | May not have one | Always has one |
| Find via | *#06# or Settings | Settings or device box |
What is an IMEI used for?
The IMEI is primarily a network identifier. Mobile carriers use it to connect your device to their network — separately from your SIM card. This means even if you swap SIM cards, your device is still identifiable by its IMEI.
Key uses of IMEI:
- Connecting to mobile networks (calls, SMS, data)
- Reporting a stolen or lost phone to carriers and police
- Blacklisting stolen devices so they cannot connect to any network
- Verifying a device before purchase on the second-hand market
- Checking carrier lock status
What is a serial number used for?
The serial number is the manufacturer's internal identifier for your specific device unit. It is used for after-sales service and support.
Key uses of serial number:
- Checking warranty status with the manufacturer
- Booking repairs at authorized service centers
- Verifying a device is genuine and not counterfeit
- Checking if a device has been reported as stolen by the manufacturer
- AppleCare and Samsung Care+ registration
Which one should I use?
Use your IMEI when: you want to check if a phone is blacklisted, report a stolen phone, check carrier lock status, or verify a phone before buying second-hand.
Use your serial number when: you are checking warranty status, booking a repair, or contacting manufacturer support.
Do tablets have IMEIs?
Only tablets with cellular connectivity (4G/5G) have IMEIs. Wi-Fi only tablets do not have an IMEI because they never connect to mobile networks. They do have serial numbers. This is one of the clearest examples of the difference between the two identifiers.
How to find both numbers
IMEI: Dial *#06# on any phone. Also found in Settings → About Phone.
Serial number (iPhone): Settings → General → About → Serial Number.
Serial number (Android): Settings → About Phone → Serial Number (location varies by brand).
Both numbers are also printed on the original device packaging and, in many cases, on a sticker inside the SIM tray or under the battery.
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