Default [Q] Font not working

Hello everyone

I have htc desire hd and recently want to load bangla font on it
Tried downloading keyboard that has bangla letters or font so i can type but it does not seem to work

A person sent me a whatsapp text that has bangla message on their sony xperia tipo
But when i receive it
It comes up as empty blanks or boxes thats all

Any idea how to resolve it

Both phones are android