IMEI vs Serial Number: What’s the Difference?

When checking a phone, you may see two different identifiers: the IMEI number and the serial number.

Many people think they are the same, but they are not.

Both numbers are used to identify a device, but they serve different purposes. Understanding the difference can help you verify a phone before buying, selling, or requesting support.

What Is an IMEI Number?

IMEI stands for International Mobile Equipment Identity.

It is a unique 15-digit number assigned to a mobile device. Carriers use the IMEI to identify phones on their networks.

An IMEI is commonly used for:

• Checking blacklist status
• Verifying carrier lock status
• Identifying the phone model
• Tracking a lost or stolen device through carrier systems

The IMEI is especially important when buying a used phone.

What Is a Serial Number?

A serial number is another unique code assigned by the manufacturer.

Unlike the IMEI, the serial number is mainly used by the brand for:

• Warranty verification
• Repair tracking
• Internal product identification
• Support requests

Apple, Samsung, and other manufacturers often ask for the serial number when checking warranty or service status.

IMEI vs Serial Number: Main Difference

The main difference is simple:

• IMEI is mainly used by mobile carriers and network systems
• Serial number is mainly used by the manufacturer

In other words:

• The IMEI identifies the phone on cellular networks
• The serial number identifies the device in the brand’s internal system

When Should You Use the IMEI?

You should use the IMEI when you want to:

• Check if a phone is blacklisted
• Verify if a device is carrier locked
• Confirm phone model details
• Check if a used phone is safe to buy

👉 Run an IMEI check on IMEIFAST

When Should You Use the Serial Number?

You should use the serial number when you want to:

• Check warranty information
• Contact the manufacturer for support
• Verify repair or replacement history
• Confirm the device in official brand systems

Can Two Phones Have the Same IMEI or Serial Number?

No. Both identifiers are meant to be unique to each device.

A legitimate phone should have its own IMEI and its own serial number.

If these numbers appear altered or do not match the device details, that can be a warning sign.

Where to Find IMEI and Serial Number

You can usually find both in these places:

In phone settings

Go to:

Settings → About Phone

By dialing the IMEI code

Dial:

*#06#

This usually shows the IMEI.

On the device box

Many phones have the IMEI and serial number printed on the retail box label.

Which One Is More Important When Buying a Used Phone?

If you are buying a used phone, the IMEI is usually more important.

That is because the IMEI can help you check whether the phone is:

• Blacklisted
• Reported lost or stolen
• Locked to a carrier

The serial number is useful too, but the IMEI gives you more protection before purchase.

The IMEI number and serial number are both important, but they are used for different things.

The IMEI helps identify the phone on carrier networks, while the serial number is mainly used by the manufacturer for warranty and support.

If you are checking a used phone before buying, start with the IMEI.