Think of Siri like your personal translator, it’s super easy to use on iOS:
1 Summon Siri on the iPhone or iPad by using a button press or Hey Siri voice command
2 Tell Siri “Translate (phrase) into (language)”, where language is either Spanish, French, German, Italian, or Mandarin Chinese
Siri will instantly translate the phrase into the language specified. The translation is immediately spoken aloud, and also written out in text on the phone. Additionally, there is a little play button next to the translation to play the spoken translation again, so you can easily repeat the translated phrase too.
The key is to tell Siri specifically at the start of the command either to “translate” or ask “how do you say”, followed by the phrase and the language. If you simply tell Siri a phrase and then follow it up with “in (language)” it will not work properly. For example if Siri starts trying to search the web for something you asked, you didn’t make the right request, or Siri interpreted you wrong, or you’re speaking to it wrong.
Not all major languages are supported yet; currently Siri only can translate between English, Spanish, French, Italian, German, and Mandarin Chinese.
Requirements for Siri translation is that the iPhone or iPad be running iOS 11 or later and has an active internet connection, either cellular or wi-fi.