The Subscriber Identity Module (SIM) is a smart card chip, of how big a postage stamp, which when inserted in your cellular phone, forms the intelligent supply of the many types of communications. A Smart Card is an integral 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 one other being a kind of a microprocessor circuitry consisting of memory or microprocessor components.
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The SIM is a microprocessor unit with memory storage capability, which stores all the initial details about your account. It holds your identity in the form of your account number with the company and identifies you to the network. The currently available SIM card has 16 to 64 kb of memory, which stores your individual telephone numbers that you call, text messages that you obtain or send and other value added services. You can find often options given as value added services where you can download a photo or MP3 songs and even a band tome for your mobile. The memory storage obtainable in your SIM card stores these data or information for you to avail them as and once you require. There is a demand of larger memory spaces to store high res pictures, large MP3 files and also enable live video streaming.

Among the third generation cellular phone technologies is named Universal Mobile Telecommunications System (UMTS). A Universal Subscriber Identity Module (USIM) is a credit card applicatoin for UMTS mobile telephony running on Universal Integrated Circuit Card (UICC). UICC is another type of chip smart card utilized in GSM and UMTs. Unlike SIM, this card features a huge memory space and holds a few kilobytes of data. With the coming of more services the storage space in the smart chip have 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 can be found on the cornerstone 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 regular debts or as a pre-paid subscriber, where you pay a specific charge ahead of time for the service that you want. This is dependent upon the type of contract that you sign.

Two SIM cards may also be utilized in your mobile phone. All you need to complete is to get dual SIM cover from your own dealer for the type of the mobile phone that you have. It’s many advantages viz. you could hold two SIM cards in one cell phone, featuring pay-as-you-go and pre-paid as well, for your office and personal use respectively.

In all the cases, the SIM can be taken off the cellular phone, enabling you to transport your mobile subscription and data through various kinds of cell phones that you might choose to have across the line of GSM phones available. It could so happen that the cellular phone with the SIM card in it is misplaced somewhere, stolen or lost. You might, at the earliest, request the service provider to deactivate that SIM, giving them the reasons why, and acquire another replacement card for your phone. You may well be liable to pay for a charge to the supplier for issuing the duplicate SIM card to you.

Generally the cell phones available are’SIM unlocked’and as such it may be used with any SIM card from any carrier in the world. Guided by the contract you sign, many mobile phones are’SIM locked’by the supplier, and in all the circumstances, till a particular contract period. The crooks to will not assist another SIM card as in the former case.