ESN stands for Electronic Serial Number. It is a unique identifier for a mobile device; no two devices share the same ESN. Here's how to find your smartphone's ESN/IMEI.

An ESN can have several formats, including IMEIs and MEIDs. Most modern smartphones use an IMEI number as an identifier, but some older CDMA devices use a MEID. GSM, unlocked, and newer CDMA devices use IMEI numbers.

You can check your ESN here using Swappa's free ESN Check service.

Swappa requires users to provide the ESN / IMEI / MEID for each device when creating a listing as a verification step.

For more information about ESNs, please refer to this Wikipedia page.

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