Hello Yoms76,
Being able to use Siri offline is a great feature and you've come to a great place for help! To start, have you verified this feature is supported in your region? If not, make sure your country is listed in the following article for "Siri: On-Device Speech Processing and Offline Requests."
iOS and iPadOS 16 Feature Availability
If it's supported in your region, you'll want to complete the steps listed below. These steps are specific to resolving issues with Siri not responding as expected. These steps are also listed in the following article, along with additional steps you can complete to help resolve this issue.
- "Go to Settings.
- Tap Siri & Search.
- Tap Siri Responses.
- Tap Prefer Spoken Responses to hear Siri speak responses, even when Silent mode is turned on."
If "Hey Siri" isn't working on your iPhone
Let us know how that goes!