The Global System for Mobile Communications (GSM) is among the most widely used cellular technology throughout the world. GSM is utilized for a number of uses, but mainly for voice communication and SMS. Security is essential for Global System for Mobile Communications GSM. The security consists of elements utilized to shield the numerous stakeholders, for example service providers & subscribers. In this project, we will discuss: Security Attacks, Cryptographic Protection Methods, Mobile Station (MS), Cryptanalytical Attacks against GS, etc.