I havw been using bsnl for a while now and I can say that if the network is close to you than it will give speed like no other even if it's only a 3g network but the issue begins when when you're not close to the network then it goes to 2g on it's own and doesn't even give you 2g speed so rather than focusing on 5g I think they should rather fix their network first so when they do upgrade it's atleast desent.