Limited availability of airwaves and high base price to blame
Jio's addition of 8.26 million customers in June was higher than the 8.18 million it reported in May
While Reliance Jio Group's CTO Jagbir Singh had joined the company before the soft launch of 4G services, Shyam Prabhakar Mardikar was serving as CTO of Airtel's mobile network since January 2017
Jio is in a neck-and-neck battle with Airtel, which added a similar number of subscribers as Jio in the 15 months from February 2017 to April 2018
Telecom operators levy IUC on incoming calls from other networks and the charges are passed on to subscribers