Over the three-month period, Airtel's stock price has rallied from Rs 432 to Rs 540, while Vodafone Idea has risen from Rs 9.2 to Rs 11.8 per share.
The regulator on Thursday asked the Mukesh Ambani-led Reliance Jio to withdraw the three-month 'complimentary' offer of unlimited data usage and free calls on payment of a minimum Rs 303.
Das will 'mentor the Jio Division of Reliance Retail', the Reliance Industries head said.
Isha and Akash, 23, were appointed to the boards of Reliance Jio Infocomm Ltd and Reliance Retail Ventures Ltd, the company said.
Letter to telecom secretary alleges Jio is masquerading full-blown services in the guise of a trial; no word from Reliance.
Communist Party of India-Marxist general secretary Sitaram Yechury described it as a "brazen destruction of the foundations of our democracy".
Spectrum trading will happen in 9 circles.