!!! Overview
[{$pagename}] ([IMSI]) is a [Unique Identifier] on all [Mobile Networks] of the [End-User] by the [Mobile Network Operator] ([MNO]) and is stored as a 64 [bit] field and is sent by the phone to the [network]


[{$pagename}] is used to bill and track the [Person] which ideally is the [Identification] only known by the [Home Location Register].

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[{$pagename}] is usually replaced by [Temporary Mobile Subscriber Identity] ([TMSI]) to prevent [eavesdroppers] identifying and tracking the [Phone subscriber] ([End-User]) on the [Mobile Network].
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[{$pagename}] is used for acquiring other details of the [Mobile Device] in the [Home Location Register] ([HLR]) or as locally copied in the [Visitor Location Register].


[{$pagename}] is used in any [Mobile Network] that has an [Interconnection] with other [networks]. For [GSM], [UMTS] and [LTE] networks, this number was provisioned in the [SIM] card and for cdmaOne and CDMA2000 networks, in the phone directly or in the [R-UIM] card (the [CDMA] equivalent of the [SIM] card). Both cards have been superseded by the [UICC]. 


[{$pagename}] to connect [Mobile Device] calls and communicate with the [Mobile Device] [UICC] cards. 

The format is:
* The first three digits represent the [Mobile Country Code] ([MCC]).
* The next two or three digits represent the [Mobile Network Code] ([MNC]) although three-digit MNC codes are allowed by [E.212] but are mainly used in the [United States] and [Canada].
* The next digits represent the [Mobile Subscriber Identification Number] ([MSIN]). 
The [{$pagename}] is normally there will be 15 digits but could be fewer due to the [MNC] or if national regulations indicate that the total length of the [IMSI] should be less than 15 digits.

!! More Information
There might be more information for this subject on one of the following:
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