Sanjeev Aga, managing director, Idea Cellular plans to retire by end-March 2011. Himanshu Kapania, currently director, operations, will succeed Aga as Idea’s new managing director from 1 April 2011. Kapania has been made the deputy managing director of the company and his position has been taken over by Ambrish Jain, currently director, operations for the company?s North and East circles.