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Find Sim Card Tutorials

by Williemae Haenke (2019-10-28)


The Subscriber Identity Module (SIM) is a smart card chip, of the size of a postage stamp, which when inserted within your mobile phone, forms the intelligent source of the different kinds of communications. A Smart Card is an integrated circuit card (ICC) and is defined as a miniature card with embedded integrated circuit. Although there are lots of applications, ICCs are catagorised into two broad segments. One is the non-volatile memory card which contains only the storage components, and also the other being a sort of a microprocessor circuitry consisting of memory or microprocessor components.

page1-93px-Detainee_Review_Board_dossierThe SIM is a microprocessor unit with memory storage capability, which stores all of the unique information regarding your account. It holds your identity in the form of your account number with the vendor 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, texts that you get or send and other value added services. You will find often options given as value added services in which you can download a picture or MP3 songs and also 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 whenever you require. There is a demand of larger memory spaces to store high resolution pictures, large MP3 files and enable live video streaming.

Among the third generation smart phone technologies is called Universal Mobile Telecommunications System (UMTS). A Universal Subscriber Identity Module (USIM) is definitely an application for UMTS mobile telephony running on Universal Integrated Circuit Card (UICC). UICC is another sort of chip smart card utilized in GSM and UMTs. Unlike SIM, this card has a big memory space and holds a number of kilobytes of data. With the coming of more services the storage area within 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 really is the USIM application. The SIM that you've got 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 supplier. They are available either on a pay-as-you-go basis, in which you get your monthly bills or as a pre-paid subscriber, in which you pay a specific charge in advance for the service that you want. This relies upon the kind of contract that you sign.

Two SIM cards can also be employed in your mobile device. All you need to do is to buy dual SIM cover from your dealer for the example of the smart phone that you've got. This has many advantages viz. you might hold two SIM cards in a single smartphone, featuring pay-as-you-go and pre-paid as well, for your office and personal use respectively.

In the majority of of the cases, the SIM may be removed from the phone, permitting you to carry your mobile subscription and data through various kinds of smartphones that you might decide to have along the line of GSM mobile devices available. It may so happen that the smartphone with the SIM card in it really is misplaced somewhere, stolen or lost. You might, at the earliest, request the vendor to deactivate that SIM, giving them the reasons as to why, and acquire another replacement card for your new smart phone. You might be liable to pay a charge to the provider for issuing the duplicate SIM card to you.

Generally the smart phones available are 'SIM unlocked' therefore it may be used with any SIM card from any carrier worldwide. Guided through the contract you sign, many smartphones are 'SIM locked' by the vendor, and in most of the circumstances, till the specific contract period. These mobile devices will not work with another SIM card as within the former case.

The embedded circuitry of the SIM card holds information about the service plan that you have chosen as a subscriber. The details about your current area location (LAI) in the network is also stored through the SIM as network information. You will find that when you switch on your smartphone, the software within, searches for the network that you are registered with and lock you on to that company. It does so by taking the required data from your SIM and look for the LAI it was in.

The SIM card within your smartphone identifies you, by holding a worldwide Mobile Subscriber Identity (IMSI). All GSM and Universal Mobile Telecommunications System (UMTS) network users are uniquely linked to IMSI, which number is stored within the SIM. Whenever a call is made, the mobile phone sends this number to the network which is used to acquire other details from the Home Location Register (HLR) or as available in the Visitor Location Register (VLR). The VLR contains all of the data of the subscriber, that are required for any call handling and mobility management in the area controlled through the VLR. As a result of security reasons, the IMSI is sent out very rarely and TMSI is sent instead, which is the Temporary Mobile Subscriber Identity and is very often used.

For security purposes, the SIM card features storage of Personal Identification Number (PIN) code, which is a 4-8 digit password chosen by you, and entered each time you wish to get access to your mobile phone. There's also a PIN2, used to get access to more advanced features within the mobile and will be available for GSM II applications. On error, the system enables you to enter the password three times prior to the finding sim cards card get locked and you would need a Personal Unblocking Key (PUK) through your network operator to unblock your mobile. PUK2 is utilized for similar purpose as PUK, but for PIN2.

As well as the smartphone smart cards stated earlier, viz., SIM and USIM, the next will be the other types that have application within different network technology:

ISIM - IP International Services Identity Module is a smart card like the SIM, which is applicable in a UICC smart card environment in a 3G (Third Generation Technology) mobile telephone in the IP Multimedia Subsystem (IMS) environment. IMS is architecture for telecom operators applied to a standarised Next Generation Networking (NGN), a network that usually encompasses data and voice communication, and additionally the optionally available media, such as video. ISIM can co-exist with SIM and USIM, provided that they can be on the same UICC.

R-UIM - The Removable User-identity Module is like a SIM but capable of working with both, in CDMA and GSM smartphones and networks. The R-UIM fits into any existing GSM mobile device and is compatible with any GSM SIM.

W-SIM - The Wilcom SIM has been developed by Willcom, which, in addition to the functions of a SIM, provides radio receiver/transmitter facilities as its built-in feature.