Seemingly cell cos in india have lost 10% in ARPU after making the incoming calls free. Partly due to the loss in revenues ( as the termination charge is now 25% of the revenues when incoming calls were charged). Also cell operators blame the expensive spectrum which is based on the number of subscribers and not on the number of minutes/airtime ppl talk.
Data: in the last 5 months, the talk time has gone up from 350 minutes to 700 minutes.