As you know the network service provider is depend upons area somewhere MTNL is good but in most of places its fails to satisfy the customer . speed is good but connection and reliability is very poor or even they charging more than others .they are not changing acc to time .
connection is not good you are lucky if it is working in your area .
now, talking about service and support it is worse .
they did not take it seriously as they are govt employer you have to put more time and effort to resolve the issue
and I din not take to much headache and in even in disconnection or for new connection they ask to do lot of procedures .
and the plans are more costly than other brands,
GO with your own risk OTHERWISE choose a other one