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  1. Originally Answered: What is the full form of SIM?
    S: Subscriber

    I: Identity or identification

    M: Module

    When the first SIM card was invented, it was almost of the size of a credit card. But the newest standard of a SIM contains a size of 15mm by 12mm. Now a days, some smart phones uses micro and nano SIM cards which are different in sizes.

    The first SIM card was made by Munich smart card maker Giesecke and Devrient in 1991. The SIM was initially specified by European Telecommunication Standards Institute.

    A subscriber identity module or subscriber identification module is an integrated circuit that is intended to securely store the international mobile subscriber identification (IMSI)

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