PAWAR, GAURI2013-10-012013-10-012013-10-01http://dspace.vpmthane.org:8080/jspui/handle/123456789/3182GSM, the Global System for Mobile communications, is a digital cellular communications system which has rapidly gained acceptance and market share worldwide, although it was initially developed in a European context. In addition to digital transmission, GSM incorporates many advanced services and features, including ISDN compatibility and worldwide roaming in other GSM networks. The advanced services and architecture of GSM have made it a model for future third-generation cellular systems. This paper will give an overview of the, the system architecture, and services offered by GSM.en-USOVERVIEW OF THE GSM CELLULAR SYSTEMOther