I am using a wifi modem given by mtnl. Yesterday when I tried to connect my phone to wifi, I couldn't load anything. It was working till afternoon but suddenly this started happening in the evening. My phone connects to the wifi but the wifi icon in the mobile phone is grey, not blue like before. I tried with other devices as well but they have the same problem so there is something wrong with the modem or settings. I had rebooted the modem but didn't work. I hadn't changed any settings of my pc. I don't want to reset the modem and call mtnl for the modem settings. The model number of my modem is DM 856W. What should I do?