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Prepaid USA Phone Cards US Sim Card Ready To Buy In The UK
Posted on July 12, 2011 by Clyde Thorburn
Individuals and groups of people who purchase US sim phone cards from HolidayPhone will be interested to know that there are two different types of dual sim card mobile phones that are manufactured by various mobile phone manufacturers. The two types of dual sim card mobile phones include one that first allows the owner to switch between the US prepaid sim cards, where as the second mobile phone allows the owner to have both US prepaid sim cards to be active at the same time. Two types of sim card operating systems are also manufactured and available. The two systems are Native and Java Card. These two sim card operating systems or cards are currently being used in most mobile phones.
Owners of a prepaid sim card or a prepaid USA sim card will be fascinated to learn that Native sim cards are based on proprietary, vendor-specific software, compared to the Java Card sim cards that are based on standards that are a subset of the Java programming language particularly targeted at embedded devices. Java Card permits the sim card to hold programs that are hardware independent and interoperable. Sim cards store network-specific information used to confirm and identify subscribers on the network. The most important of these are the ICCID, IMSI, Authentication Key (Ki), Local Area Identity (LAI) and Operator-Specific Emergency Number. These terms sound very technical but in fact are really quite simple to understand.
To clarify these terms for people owning US sim phone cards, Wikipedia explains the ICCID as, quote “Each sim is internationally identified by its Integrated circuit card identifier (ICCID). ICCIDs are stored in the SIM cards and are also engraved or printed on the SIM card body during a process called personalization. The ICCID is defined by the ITU-T recommendation E.118 as the Primary Account Number. Its layout is based on ISO/IEC 7812. According to E.118, the number is up to 19 digits long, including a single check digit calculated using the Luhn algorithm. However, the GSM Phase 1 defined the ICCID length as 10 octets with operator-specific structure. These terms need to be understood by prepaid USA sim card owners” end quote.
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