For example, if a mobile phone is stolen, the owner can have their network provider use the IMEI number to blocklist the phone. GSM networks use the IMEI number to identify valid devices, and can stop a stolen phone from accessing the network. It is usually found printed inside the battery compartment of the phone but can also be displayed on-screen on most phones by entering *#06# MMI Supplementary Service code on the dialpad, or alongside other system information in the settings menu on smartphone operating systems. The International Mobile Equipment Identity ( IMEI) is a numeric identifier, usually unique, for 3GPP and iDEN mobile phones, as well as some satellite phones.
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