Gsm ( Global System For Mobile Communication

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Acknowledgement
At first I want to express gratitude to the Almighty Allah for his endless kindness to give me the chance to work under tremendous supervision of my honorable teacher Dr. Arshad M. Chowdhury to give me the opportunity to work on an enormous task.

Objective:
GSM (Global System for Mobile communication) is a digital mobile telephony system which is TDMA based wireless network technology developed widely in Europe and other parts of the world. GSM uses a variation of time division multiple access (TDMA) and is the most widely used of the three digital wireless telephony technologies (TDMA, GSM, and CDMA). GSM digitizes and compresses data, then sends it down a channel with two other streams of user data, each in its own time slot.
GSM phones make use of a SIM card to identify the user 's account. The use of the SIM card allows GSM network users to quickly move their phone number from one GSM phone to another by simply moving the SIM card. Currently GSM networks operate on the 850MHz, 900MHz, 1800MHz, and 1900MHz frequency bands. Devices that support all four bands are called quad-band, with those that support 3 or 2 bands called tri-band and dual-band, respectively. In the United States, Cingular operates on the 850 and 1900MHz bands, while T-Mobile operates only on the 1900MHz band.

GSM security:-

Security is the degree of protection against damages, danger, loss and crime. In our days, the need for security makes many people look for different ways in
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