As much as we love Siri, it's not for everyone. Here is how you can turn Siri off on your iPhone and on macOS.
It's worth remembering that once you turn Siri off, you won't be able to use voice dialling, or voice control, including being able to dictate.
To disable Siri on an iOS device:
Siri anonymously monitors your behaviour so that it can offer up useful suggestions for websites and in apps when performing searches. If you no longer wish to use Siri Suggestions:
Once you've done this, you can clear all of your information from Apple's servers as described in this article.
It's worth disabling Dictation on your iOS device as well since it won't work anymore. This is also necessary if you wish to remove all of your voice data from Apple's servers.
Deactivating Siri on a Mac is also reasonably straightforward.
Like Siri on iOS, disabling Siri on macOS doesn't automatically remove all of your voice data from Apple's servers. For that, you have to turn off Dictation.