According to Mr. Gaikwad who works at BKC, ACT HSDPA message needs to be sent to 444 to enable HSDPA speeds. Activation charge is around Rs. 400. He suggested that we activate HSDPA and not 3G. I was angry and told him that I have already paid Rs. 300 a year ago to activate 3G and cannot pay activation charges every time just to upgrade speeds.Edit:Mr. Gaikwad is the man!!!HSDPA network is enabled on my phone now. Speeds easily reaching 2.5 mbps Now a happy Panda