Those Sigma prices look very tempting but I must say that the website doesn't inspire much confidence. Currently I am on Tata Indicom 256 unlimited and while it is a bit expensive I will probably continue for the time being. If I see a tempting 512 UL plan for the right price I might switch. Maybe Tata themselves will drop prices around Diwali.BTW Netfreak (or anyone else), which company offers those EDGE plans in Bombay? Are they unlimited and how much do they cost per month? I don't have an EDGE capable handset currently but if these plans are reasonably priced they might be the way to go.