Hi, I'm Vietnamese, we use Unicode fonts like "timesnewroman" or "Arial" for our documents.
So, how can I add these fonts to my BB8100.
Thank you very much!

The built in fonts are the only ones available - under the Screen/Keyboard settings. I'm not aware of any other fonts available (without third party software), and the device is inherently a text only device, so if you did get an Arial font, everything would be displayed with that font. You wouldn't be able to compose an email and change from one font to another.