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Prepaid USA Phone Cards US Sim Card Available To Buy In The UK
Posted on July 13, 2011 by Clyde Thorburn
Continuing on with the definitions of a few important sim card and prepaid sim card concepts for those people who own and use US sim phone cards from Holiday phone the explanation from Wikipedia of an IMSI is, quote “An International Mobile Subscriber Identity or IMSI is a unique identification associated with all GSM and UMTS network mobile phone users. It is stored as a 64 bit field in the SIM inside the phone and is sent by the phone to the network. It is also used for acquiring other details of the mobile in the Home Location Register (HLR) or as locally copied in the Visitor Location Register. To prevent eavesdroppers identifying and tracking the subscriber on the radio interface, the IMSI is sent as rarely as possible and a randomly-generated TMSI is sent instead” end quote.
Another technical term that needs to be understood by those who have purchased a prepaid USA sim card from HolidayPhone is the Authentication Key (Ki) which Wikipedia describes as, quote “The Authentication Key or Ki is a 128-bit value used in authenticating the SIMs on the mobile network. Each SIM holds a unique Ki assigned to it by the operator during the personalization process. The Ki is also stored in a database, which is known as the Authentication Center or AuC, on the carrier’s network” end quote. There a lot more of these technical terms that are used to describe the creation, use and operation of sim cards but only the main ones will be explained in this content specifically for prepaid US sim card holders.
The next term to be explained is the Location area identity (LAI) which Wikipedia describes as, quote “The sim stores network state information, which is received from the Location Area Identity (LAI). Operator networks are divided into Location Areas, each having a unique LAI number. When the device changes locations, it stores the new LAI to the SIM and sends it back to the operator network with its new location. If the device is power cycled, it will take data off the SIM, and search for the previous LAI. This saves time by avoiding having to search the whole list of frequencies that the telephone normally would” end quote.
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