Every mobile phone, GSM modem or device with a built-in phone / modem has a unique 15 digit IMEI number. What is it's function?
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The IMEI number is used by a GSM network to identify valid devices and therefore can be used for stopping a stolen phone from accessing that network. For example, if a mobile phone is stolen, the owner can call their network provider and instruct them to "blacklist" the phone using its IMEI number.