Call any ware ( local or STD : to land line as well as mobiles ) with in India just for half a paise, per second, on a top up of Rs. 99/-, valid for 90 days. Nertwork is good. As it is prepaid plan and I did not have any issues, I don’t know anything about customer service. Though Unonor is also started similar plan recently, it’s a bit costlier than this one; Moreover Uninor signal strength is not good, especially in Bangalore.