IMEI

An IMEI is a serial number that uniquely identifies a GSM or UMTS mobile phone. Typically 15 digits long, the IMEI code is broken into sections that provide information about a phone, such as its manufacturer, to the mobile network that the phone is connected to. IMEI numbers of stolen devices are blacklisted in some countries so that the phone can not easily be used by a thief. CDMA's new MEID identifier system is compatible with the existing IMEI structure.
Also known as: "International Mobile Equipment Identity"

IMAP
ITU

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