Bharti Airtel Limited (commonly shortened to Airtel and stylised airtel) is an Indian global telecommunications services company based in New Delhi, India. It operates in 20 countries across South Asia and Africa. Airtel provides GSM, 3G, 4G LTE mobile services, fixed line broadband and voice services depending upon the country of operation. Airtel had also rolled out its VoLTE technology across all Indian telecom circles except Jammu and Kashmir and Andaman and is likely to launch in these circles soon. It is the second largest mobile network operator in India and the third largest mobile network operator in the world with over 438. 04 million subscribers. Airtel was named India's second most valuable brand in the first ever Brandz ranking by Millward Brown and WPP plc.