Guys help me, I live in chhattisgarh and I am using mtnl delhi 3g dolphin sim. It was working well until few days ago it is deducting main balance even though I have data balance, another problem is that I cant call any customer care no. or any toll free no. from it. Calls are going to normal 10 digit mob no. and incoming calls are also working well. Dialing *446# gives message "Sorry, the operation failure". Please help me