An ESN (Electronic Serial Number) is a unique identifier tied to all cellular devices. No two devices should ever have the same ESN, and reviewing this number is one of the most important steps in Swappa's listing review process. Thus, it's crucial to ensure that you provide the proper ESN when creating a listing on Swappa.

ESNs can be found in a few different formats, but the most common is the 15-digit IMEI (International Mobile Equipment Identity). However, some older mobile devices may only have an MEID (Mobile Equipment Identifier).

If you'd like to check the status of the ESN tied to your device, feel free to use the free ESN check service here! If you need a hand locating the ESN tied to your device, please review Swappa's FAQ page here.

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