I have bought BSNL prepaid sim about 3 months back and activated it by recharging it with 200rs(Bandhan Plan) which gave me detailed sms showing that I have activated bandhan plan and I got about 75mb free data with 15 to 20 mins to any network call locally.
Then later I got to know about nestam plan(20rs) from my cousin brother which gives me to call any 5 numbers at lower cost then normal voice call rate that is 15p/min to BSNL and 35p/min to other network.
BSNL is the cheapest and most reliable network in india, which covers full india even remote areas. Most of the time it comes with new STVs and offers. Customer service is gud which helped with many things like changing plan etc.So I suggest people to go for BSNL as their cellular network.