Bharti Airtel, formerly known as Bharti Tele-Ventures Limited (BTVL) is India's largest GSM mobile operator with more than 64.4 million mobile subscribers as of April 2008.^[1] It also offers fixed line services and broadband services. It offers its mobile services under the Airtel brand and is headed by Sunil Mittal. The company also provides telephone services and Internet access over DSL in 14 circles. The company complements its mobile, broadband & telephone services with national and international long distance services. The company also has a submarine cable landing station at Chennai, which connects the submarine cable connecting Chennai and Singapore. The company provides end-to-end data and enterprise services to the corporate customers through its nationwide fiber optic backbone, last mile connectivity in fixed-line and mobile circles, VSATs, ISP and international bandwidth access through the gateways and landing station.