@mbaluta,
Yes Sir, I am trying to use this version. (http://play.google.com/store/apps/details?id=com.opera.mini.native&hl=en)
But the results are same.
I tried both HTTP/SOCKET and HTTP ONLY. It's not working. My Internet settings and 3G data plan are all ok.

I'm using updated OperaMini with new icon. I faced continuously website loading problem & after some time shows "Connection Failed, Unable to Connect. Please review your network settings." Both in High & Extreme Saving Mode. Also I tried to reinstall Opera Mini but startup wasn't successful, Opera Mini stucked at the start point. I faced this problem only on my cellular data (Airtel Bangladesh) connection. But its not problem of my cellular data because I can browse anything but without Opera Mini. But its full ok on other cellular network & other WiFi connection. All other browsers are full OK to browse via Airtel network but Opera Mini didn't worked. Please fix this problem ASAP which only happened via Airtel Bangladesh network.