I have been using aircel prepaid sim for quite sometime now. It was good for me because as we are in village I can able to get the good network coverage of bsnl and aircel.
Other network signals are not upto the mark as I need to come out of the house to attend the call. The call rates in Aircel is also good compared to other network operators. The internet data is also at a affordable price. Moreever they mostly give full talk time offers for the customers for less than 100 Rs like 60 Rs=60 Rs full talk time, Rs 75= Rs 75 talk time with no validity which is very helpful for me to recharge. The plans are very good.