The language used for buttons and menus in the VIO is the same as the language you selected in your phone settings. If the selected language isn't supported by the VIO then English is used.
If you change the phone language, the voice used for spoken directions and other route instructions in the VIO might not be compatible with the new language. You will be asked to download a compatible voice.
Important: A voice can be a large file that can take a long time to download. To prevent high data charges we advise you to download a voice using Wi-Fi connection.