new delhi/bengaluru/mumbai, Dec. 19 -- Two of India's biggest private telecom operators-Bharti Airtel and Vodafone Idea (Vi)-are looking to shore up their finances and fund network investments from vastly different starting points, pursuing sharply different strategies of equity-led deleveraging and debt-led survival, respectively. On Thursday, cash-flush Bharti Airtel approved raising the remaining Rs.15,740 crore (of Rs.21,000 crore) from its 2021 rights issue by making the first and final call on outstanding partly paid-up equity shares. The same day, a struggling Vi said in an exchange filing that it has raised Rs.3,300 crore through secured, unlisted and unrated non-convertible debentures via its subsidiary Vodafone Idea Telecom Infras...