I am having the BSNL 3G plan and using it from the last few days. The thing is that am having it with my prepaid connection of BSNL and using the 3G on the same but is costing me to much. I have spend lot of money in recharging my mobile phone's connection. Now i have decided to change the mode of my connection itself. I have decided to shift from prepaid to postpaid. Is it possible form me to do it with the same number or i have to change the SIM card. I have thought about the postpaid 99 plan but not very sure whether it will suit my requirements or not. Please help me in this case to resolve my problem.