MTS - Sistema Shyam TeleServices Limited (SSTL), also known as Mobile TeleSystems and commonly referred to by the abbreviation MTS, is the Indian subdivision of Russian Mobile TeleSystems telecommunication company headquartered in New Delhi, India. It provides wireless voice, broadband Internet, messaging and data services in India. MTS India is a subsidiary of Russian conglomerate Sistema and operates across India with over 16 million customers as on 2012.