** Telecom stock Bharti Airtel gains as much as 2.3 pct, Idea Cellular gains as much as 2.9 pct
** Rival Reliance Jio Infocomm, a unit of Reliance Industries, says telecom regulator asked it to withdraw a 3-month complementary offer to subscribers
** Jio said last month customers under Jio Prime plan who pay a monthly fee by April 15 would receive three months of free services
** Jio said it will withdraw the offer "as soon as operationally feasible"
** Reliance Industries falls as much as 1.8 pct