The Electronic Serial Number (ESN) is a 32-bitidentification number for mobile terminals
in non-GSM networks. Together with the Mobile Identification Number
(MIN), it identifies the subscriber
ofa mobile network
. TheESN number is assigned by the manufacturer. In GSM networks
, thecorresponding number
isthe International Mobile Equipment Identity
(IMEI). Since 2006, manufacturers have been transitioning from the Electronic Serial Number (ESN) to the Mobile Equipment Identity (MEID).