Three 12GB Data Preloaded Sim Card is a smart card chip, of the size of a postage stamp, which when inserted in your mobile phone, forms the intelligent source of the various types of communications. A Smart Card is an integrated circuit card (ICC) and is defined as a miniature card with embedded integrated circuit. Though there are many applications, ICCs are catagorised into two broad segments. One is the non-volatile memory card which contains only the storage components, and the other being a kind of a microprocessor circuitry consisting of memory or microprocessor components.
The SIM is a microprocessor unit with memory storage capability, which stores all the unique information about your account. It holds your identity in the form of your account number with the service provider and identifies you to the network. The currently available SIM card has 16 to 64 kb of memory, which stores your personal telephone numbers that you call, text messages that you receive or send and other value added services. There are often options given as value added services where you can download a picture or MP3 songs and even a ring tome for your mobile. The memory storage available in your SIM card stores these data or information for you to avail them as and when you require. There is a demand of larger memory spaces to store high resolution pictures, large MP3 files and also enable live video streaming.
One of the third generation mobile phone technologies is called Universal Mobile Telecommunications System (UMTS). A Universal Subscriber Identity Module (USIM) is an application for UMTS mobile telephony running on Universal Integrated Circuit Card (UICC). UICC is another type of chip smart card used in GSM and UMTs. Unlike SIM, this card has a huge memory space and holds a few kilobytes of data. With the coming of more services the storage area in the smart chip need to be larger. In a GSM environment, the UICC has an application of that of SIM where-as in a UTMS environment it is the USIM application. The SIM that you have is uniquely identified by its International Circuit Card ID (ICCID).
SIM cards are available on the basis of a subscription on signing a contract with the service provider. They are available either on a pay-as-you-go basis, where you get your monthly bills or as a pre-paid subscriber, where you pay a certain charge in advance for the service that you want. This depends on the type of contract that you sign.
Two SIM cards may also be used in your mobile phone. All you need to do is to buy dual SIM cover from your dealer for the model of the mobile phone that you have. This has many advantages viz. you could hold two SIM cards in a single mobile phone, featuring pay-as-you-go and pre-paid as well, for your office and personal use respectively.
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