There are so many internet service providers.. but nobody will match with the quality of service being provided by MTNL. Only available in Delhi & Mumbai.. have no idea about BSNL .. its other counter part in rest of the country.
MTNL has improved a lot .. & the best is the billing is totally transparent .. take the unlimited plan .. no hidden charges.. & very good speed.. instantly redressal of problems.. no other ISP can match with it .. just MTNL