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Electronic Serial Number (ESN)

What does Electronic Serial Number (ESN) mean?

An electronic serial number (ESN) is a unique identification number embedded by manufacturers on a microchip in wireless phones. The ESN is automatically transmitted to a base station when a call is made. The carrier’s mobile switching office then detects the ESN and checks the validity of the call to prevent fraud.

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Techopedia explains Electronic Serial Number (ESN)

The electronic serial numbers are used in devices using code division multiple access (CDMA) technology. A 32-bit ESN has 8 bits representing a manufacturer code, 18 bits for a unique serial number and 6 bits reserved for future applications. The numbers are also used for time attendance and registration tracking.

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