In addition to being programmed into the phone's microchip, the ESN typically is found on a label under the cellular phone's battery. Number is used by the GSM network to identify valid devices and therefore can be used for stopping a stolen phone from accessing the network in that country.ĮSN - Electronic Serial Number is a unique 32-bits identification number embedded by manufacturers in wireless phones. The IMEI is only used for identifying the device and has no permanent or semi-permanent relation to the subscriber. The IMEI (International Mobile Equipment Identity) is a unique number to identify GSM, WCDMA, and iDEN mobile phones, as well as some satellite phones. The decimal form is specified by 18 digits grouped in a 5 5 4 4 pattern. A check-digit can be converted from the 18 digit result using the base 10 Luhn algorithm and appended to the end.
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