I have been using bsnl 3g on my mobile samsung Galaxy 3 in chennai vadapalani/guindy area.Guindy:daytime 500Kbpsevening 300Kbpsnight 150KbpsVadapalani:morning/night 50Kbps (hardly) 3g is not active. only on gprs. when i complained they say they are having some problems. but i dont think that is true. but registered a complaint.Please share your experience in chennai. I had plans of buying a datacard and using this sim. but with this kind of speed it seems to be not worth it.thanksrsennat