Advantages and drawbacks as followed.
Advantages.
Bsnl is a all ovwr India company and hence it gives better services .the broadband service in Nagpur is good and never is off like others the server is never down this is good but now disadvantages
They give a connection speed of only 64 kbps and I pay full bill of unlimited plan this is wrong the speed goes only up when it is the first day of the bill or month they give 1 mbps but not daily this is wrong and the services and ppl sitting in office are all old ones and slow.