International Mobile Equipment Identity information
Cellphone identification code
IMEI number - an example
The International Mobile Equipment Identity (IMEI)[1] is a numeric identifier, usually unique,[2][3] for 3GPP and iDEN mobile phones, as well as some satellite phones. It is usually found printed inside the battery compartment of the phone but can also be displayed on-screen on most phones by entering the MMI Supplementary Service code *#06# on the dialpad, or alongside other system information in the settings menu on smartphone operating systems.
GSM networks use the IMEI number to identify valid devices, and can stop a stolen phone from accessing the network. For example, if a mobile phone is stolen, the owner can have their network provider use the IMEI number to blocklist the phone. This renders the phone useless on that network and sometimes other networks, even if the thief changes the phone's SIM card.
Devices without a SIM card slot or eSIM capability usually do not have an IMEI code.[4] However, the IMEI only identifies the device and has no particular relationship to the subscriber. The phone identifies the subscriber by transmitting the International mobile subscriber identity (IMSI) number, which is stored on a SIM card that can, in theory, be transferred to any handset. However, the network's ability to know a subscriber's current, individual device enables many network and security features.[citation needed]
Dual SIM enabled phones will have two IMEI numbers.
^"3GPP TS 22.016: International Mobile Equipment Identities (IMEI)" (ZIP/DOC; 36 KB). 2009-10-01. Retrieved 2009-12-03.
^"Phone firms defend security record". BBC News. January 8, 2002. Retrieved August 25, 2011.
^GSM Europe, ""GSME proposals regarding mobile theft and IMEI security""., 2003-06
^"How to activate license when no IMEI available". Archived from the original on 19 July 2019. Retrieved 19 July 2019.
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