Sunil Mittal led Bharti Airtel has crossed the 650-million customer mark globally, fortifying its position as the world’s second-largest telecom operator by mobile subscriber base, as per a regulatory filing by the telecom operator. “According to GSMA Intelligence, Bharti Airtel is ranked second globally by mobile customer base, with operations spread across India and Africa,” the filing said. Commenting on this milestone, Gopal Vittal, Executive Vice Chairman, Bharti Airtel, said: “Achieving the milestone of 650 million customers to be the second largest operator globally is a great responsibility for us to serve our customers better every day,”