Bsnl is one good reputated operator. But they still have issue any other kinds. As example most of areas bsnl 3g is working most them not.
Bsnl is control in under goverment . So you know goverment works are slow .
But bsnl best 3g as well as 2g plans locals plans . Calling etc.
As example happen with me.
I was calling my friend its say whom you are contacting is out coverage are try
And just one second later call him calls get connected.
As bsnl have minor issue but if they will great operator anong compare to popular ones.