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An international mobile station equipment identity, or IMEI, is a unique number that identifies a mobile phone. It is often checked against a list of stolen phones before allowing a device to connect to a cellular network.
An electronic serial number, or ESN, is a unique identifier for a wireless handset. The ESN system was replaced with the MEID system, but some major carriers still use it.
A mobile equipment identifier, or MEID, is a unique number that identifies a wireless handset. This system replaced the electronic serial number (ESN) system in 2006.