To view Bangla on your favourite Opera Mobile simply go through the following process :
Now insert this font in E:>System >Apps >OperaMobile >fonts2.
You need also to move the existing font of fonts2 folder to E:>System >Apps >OperaMobile >fonts
Now restart your phone & enjoy viewing Bangla on your Opera Mobile.
Note : Here ‘E’ denotes to the Memory Card of your phone.