Bsnl has introduced rationalized prices for both of it’s prepaid & postpaid services. A good thing for postpaid users who are always ripped of by everyone as they can pay more.
32k & 64k sim also called 2G/3G sim cards are for Rs.10 only. (includes GST)
128k Sim for 2G/3G/4G services is also Rs.10(includes gst)
256k sim again for 2G/3G/4G services is for Rs.50(inc. gst)
For now you can buy any sim as Bsnl is 3G only operator.
Maybe in future(when don’t know?) when Bsnl launched 4G the 128k & 256k would be the only choice.
Prices effective 6th July 2017.