The Subscriber Identity Module (SIM) is a smart cards chip, of the size of a postage stamps, which when inserted in your mobile phone, varieties the intelligent source of the various types of communications. A Smart Cards is an integrated outlet card (ICC) and is defined as a little card with embedded included circuit. Though there are many applications, ICCs are catagorised into two wide segments. One is the non-volatile memory card which contains only the storage area components, and the other being a kind of a microprocessor circuitry including memory or microprocessor components. Save Delete
The SIM is a microprocessor unit with storage storage capability, which stores all the unique information with regards to your account. It holds your identity in the form of your account amount with the provider and identifies you to the network. The currently available SIM card has of sixteen to 64 kb of memory, which stores your own telephone numbers that you call, text messages that you receive or send and other useful services. There are often options given as value added services where you can download a photo or MUSIC songs and even a ring tome for your mobile. The memory storage space available in your SIM card stores these data or information so that you can avail them as and when you require. There is also a demand of larger memory areas to store high quality pictures, large MP3 data and also permit live video streaming.
One of the third generation mobile phone technologies is called Universal Mobile Telecommunications Program (UMTS). A Universal Prospect Identity Module (USIM) is a credit card applicatoin for UMTS mobile telephony running on Simple Integrated Circuit Card (UICC). UICC is another type of chip key greeting card used in GSM and UMTs. Unlike SIM, this card has a huge memory space and contains a few kilobytes of data. With the arriving of more services the storage space in the smart chip have to be larger. In a GSM environment, the UICC has an using that of SIM where-as within an UTMS environment it is the USIM application. The SIM you have is uniquely determined by it is International Circuit Card IDENTIFICATION (ICCID).
SIM cards are available on the most basic of a subscription on signing a contract with the service provider. That they are available either on a pay-as-you-go basis, to get your monthly expenses or as a pre-paid subscriber, to pay a certain charge in progress for the service that you want. This is determined by the sort of contract that you sign.
Two SIM playing cards could also be used in your mobile telephone. Just to buy dual SIM cover from your dealer for the model of the mobile cellphone that you have. This kind of has many advantages viz. you could hold two SIM cards within a mobile phone, featuring pay-as-you-go and pre-paid as well, for your office and personal use respectively.
In almost all of the cases, the SIM can be removed from the mobile phone, allowing you to carry your mobile subscription and data through different types of mobile phones that you may choose to acquire along the line of GSM phones available. It may so happen that the mobile phone with the SIM card in it is misplaced somewhere, taken or lost. You may, at the earliest, demand the service agency to disable that SIM, giving them the reasons as to why, and get another replacement card for your new phone. You may be prone to pay a charge to the provider for issuing the duplicate SIM card to you personally.