This FAQ applies to Lumia phones with Windows Phone 7.
Fonts: You can use customised fonts only within the apps, but they do not affect the entire system. Windows Phone 7.8 update enhances the Chinese font and improves the appearance of Arabic and other languages. A font size can be change when you are zooming an e-mail or using the Internet Explorer on the device.
Themes: You can change the system colours which affects the colour of menus and Live Tiles:
- Go to Settings > theme.
- Tap Background to select between Dark and Light, this will make the background black or white respectively.
- Tap Accent Colour to select one of several preset colours for the Live Tiles and menus.