The Full Form of SIM is Subscriber Identity Module or Subscriber Identification Module. SIM is an integrated circuit that securely stores the international mobile subscriber identity (IMSI). It is a portable memory chip used to make phone calls across the world where the subscriber's network is available. Generally, SIMs are used in mobile phones that operate on GSM network. You can use it with any supporting mobile phone because it is portable.
When the first SIM card was invented its size is about the size of a Credit Card. But the new standard size of SIM is about 15mm by 12mm. Nowadays, some smartphones also use micro or nano SIM card sizes.
The SIM card contains necessary information and it also contains some of your personal data like:
Here are some other full form of SIM used by different people but depending on situation.
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