In 4G LTE cellular systems, what is an International Mobile Subscriber Identity (IMSI)?

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Accepted Answer

A 64-bit identifier stored on a cellular SIM (Subscriber Identity Module) card that  identifies the subscriber in the worldwide cellular carrier network system.

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Assigned by a mobile carrier network to a device, when the device attaches to the radio access network, serving a similar link-layer role as MAC addresses in a wired network.

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A fancy name for a globally unique phone number, including country code.

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A 64-bit identifier that identifies the cellular network to which an mobile subscriber is attaching.  Somewhat analogous to the Autonomous System (AS) number used in BGP to identify/name networks.

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In 4G LTE cellular systems, what is an International Mobile Subscriber Identity ...

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