Adding a second language to your Google Home speaker will bring support for that language anywhere you normally interact with Google Assistant, including on your phone.
Currently, you can only select support for two languages, and you can pair any two of the eight existing supported languages: English, German, French, Spanish, Italian and Japanese.
How to add a second language:
- Open the Google Assistant app in Android or iOS and select the Explore button (shaped like a compass) in the top right corner.
- Select the action overflow (three horizontal dots) button in the top right corner.
- Select Settings.
- Go to Preferences > Assistant language.
- Select Add a language.
- Select one of the supported languages in the menu.
Once a second language is added, the assistant will respond with whichever language you first spoke to it using, meaning you can seamlessly switch between, say, Spanish and English. You can also change its voice.