Add to ORKGThis bachelor thesis is focused on mobile phone programming. The paper theoretically analyzes most expanded operating systems and Symbian operating system programming languages. Also theoretically describes the GSM technology, communication between mobile station and base station and transferred parameters of connection. Bachelor thesis includes two programs for Symbian operating system. Program FDSearch is created in Python for S60 programming language. This application serves to search directories and files in the mobile phone. The second program About Net is created in Symbian C++ programming language and is intent on capturing system information from network