BSNL provides most affortable data 3g connection with wide varity of plans to choose from.It may not the the best when compared with other network providers but it doesnt let you down aswell.It gives enough speed to do most of your thinks like downloading stuffs streaming videos and may other thinks.
I am a happy bsnl data user and I will suggest you bsnl if you belong to average family or does need net for common stuffs only.