=>open your "opera mini" app =>click"Menu" =>go to "tools" =>click"settings" =>now change the "Fontsize" as "large" =>then check the"Mobile view" box =>at last "save" the settings.
now again =>click "Menu" =>click"Enter Address" =>Write"about:config" in the "address bar"=>then "go to" config page.It will open a page named "Power~ User settings"
=>go to the below of the "Power~ User settings" page. =>u will see option named "Use bitmap fonts for complex scripts" =>check "yes" for "Use bitmap fonts for complex scripts" =>now "save" the settings.
=>now visit any Bangla unicode site.u can see the bangla fonts
=> If u don't have opera mini app in ur mobile,u can download from behind link: