The most modern telephone is the cellular telephone, or commonly Called a cell phone. A cellular telephone is designed to give the user maximum freedom of movement while using a telephone.Mobile communications is a hot topic. The number of mobile communication devices users is growing very fast. The number of mobiles (cellular phones) is now exceeding the number of fixed lines in many countries (Finland, Japan etc.).Cellular/mobile phones are everywhere and their utility is growing. A cell phone is a radio telephone, that may be used wherever "cell" coverage is provided. The role of cellular phones has risen with improvement in services, reduction in service costs and the ever increasing services available through cell phones.This paper covers the basic architecture of Cellular Communications and concentrates mainly on GSM.
