New Delhi, Jan. 4 -- After two years of intense competition and rock-bottom tariffs, which changed the pecking order in India's telecom sector and left just three operators to compete, the real battle to retain subscribers has just begun and bundled offerings are set to be the first arrows drawn from the quiver. With the mobile subscriber base reaching its peak and revenue from selling SIMs plunging after the entry of Reliance Jio in September 2016, operators are now looking at bundling other services to increase consumer stickiness in a hyper-competitive market and boost their toplines. Vodafone Idea Ltd, India's largest telecom operator by users and revenue market share, posted a '4,970 crore loss in the September quarter while Bharti Air...