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Introduction to GSM Book
Introduction to GSM Book
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Subscriber Identity Module (SIM) Subscriber Identity Module (SIM)
The subscriber identity module (SIM) is a small "information" card that contains service subscription identity and personal information. This information includes a phone number, billing identification information and a small amount of user specific data (such as feature preferences and short messages). This information is stored in the card rather than programming this information into the phone itself. This intelligent card, either credit card-sized (ISO format), or the size of a postage-stamp (Plug-In format), can be inserted into any SIM ready wireless telephone.
Subscriber Identity Module (SIM) Subscriber Identity Module (SIM) Block Diagram
Subscriber Identity Module (SIM) Block Diagram

This figure shows a block diagram of a SIM. This diagram shows that SIM cards have 8 electrical contacts. This allows for power to be applied to the electronic circuits inside the card and for data to be sent to and from the card. The card contains a microprocessor that is used to store and retrieve data. Identification information is stored in the cards protected memory that is not accessible by the customer. Additional memory is included to allow features or other information such as short messages to be stored on the card.
Physical Channels, Logical Channels, Network Functions, and Operation Introduction to GSM Books
Introduction to GSM Book
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 Introduction to GSM
This book explains the basic components, technologies used, and operation of GSM systems. This book starts with the system components and basic services that the GSM system can provide. You will learn that the key types of GSM devices include single mode and dual mode mobile telephones, wireless PCMCIA cards, embedded radio modules, and external radio modems. You will then discover the different types of available services such as multiple types of voice services, data services, group call, and messaging services.

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