I believe if we pool our info on which ISP provides Broadband and where they provide it, it'll help many users who want to get a general idea of what ISPs they've got in their area.City/Area:-ISP : CoverageTo the best of my information,Chennai:-BSNL: Almost everywhereVSNL/TataIndicom: 2nd best in coverage, and from what i've heard, not available in the southern suburbs of the city..Airtel: Mainly in Central and South ChennaiSify: Central, South and southern suburbs of ChennaiHathway,Iqara: South ChennaiReliance: Limited to Anna Nagar, Mount Road, T.Nagar and nearby areas..(Central Chennai)