I have BlackBerry Curve 9220. I had WhatsApp installed in it. I got a message saying that WhatsApp was draining by battery. I OK'ed it. Then I checked WhatsApp wasn't working anymore. It had stopped using Internet Connection from WiFi network. I had uninstalled Whatsapp. Trying to install it again I opened Browser and searched it on Google. I could not open the search result getting the error 'A communication failure has occured. The server may be busy, please try again later. If the problem persists contact your service provider.'