Siri Analyses How You Use Your Device and Apps to Provide Personalised Suggestions and Better Search Results Using Local, On-Device Processing, and Syncs Across Your Devices with End-to-End Encryption Using iCloud
Siri uses iCloud to sync personalisation across your Apple Devices using end-to-end encryption.
To Make Suggestions and Search Results More Relevant, Some Information Is Sent to Apple and Not Associated with You
When you use Siri Suggestions or Look Up, or type in Search, Spotlight, Safari search or #images search in Messages, any information sent to Apple does not identify you and is associated with a 15-minute random, rotating device-generated identifier. Your device may send information such as location, topics of interest (for example, cooking or basketball), your search queries, suggestions you have selected, apps you use and related device usage data to Apple. This information does not include search results that show files or content on your device. If you subscribe to music or video subscription services, the names of these services and the type of subscription may be sent to Apple. Your account name, number and password will not be sent to Apple.
This information is used to process your request and provide more relevant suggestions and search results, and is not linked to your Apple ID, email address or other data Apple may have from your use of other Apple services.
Aggregated information may be used to improve other Apple products and services. Common search queries may be shared with a web search engine to improve search results.
Search Engine Suggestions in Safari
Safari has a single field for searches and web addresses so you can browse the web from one convenient place. When Search Engine Suggestions are enabled, Safari will ask your selected search engine for suggestions based on what you’ve typed.
Preload Top Hit in Safari
With Preload Top Hit enabled, as soon as Safari determines a Top Hit based on your bookmarks and browsing history, Safari will begin loading the webpage in the background. If you disable this option, the page will load normally.
You Have Choice and Control
If you do not want Siri Suggestions to send your information to Apple, you can disable Siri Suggestions in Search and Siri Suggestions in Look Up by going to Settings > Siri & Search. To disable Safari Suggestions, go to Settings > Safari and tap to turn off Safari Suggestions.
You can see and control the full list of features that Siri personalises and apps that Siri suggests shortcuts for in Settings > Siri & Search. To stop apps from contributing information to personalise Siri, go to Settings > Siri & Search and tap the app name, then tap to turn off Learn from this App. To stop app clips from contributing information to personalise Siri, go to Settings > Siri & Search > App Clips and tap to turn off Learn from App Clips. You can also control whether Siri can send you suggestions on the Lock screen for each app by going to Settings > Siri & Search and tapping to turn off Suggestions on Lock Screen.
You can disable Location Services for Siri Suggestions in Search by going to Settings > Privacy > Location Services > System Services and tapping Location-Based Suggestions to turn off Location Services. If you turn off Location Services on your device, your location will not be sent to Apple. To deliver relevant suggestions, Apple may use the IP address of your internet connection to approximate your location by matching it to a geographic region.
If you do not want Siri personalisation to sync across your devices, you can disable Siri by going to Settings > [your name] > iCloud and tapping to turn off Siri.