How to Limit Siri's Access to Your Personal Data in iOS 27

iOS 27 merges Siri and Spotlight into a single search-plus-AI interface — Apple calls the new experience Siri AI — and by default it digs through your Apple apps for personal context. Messages, Notes, Mail: all searchable unless you say otherwise. If you just updated, the single most useful thing you can do is limit Siri access before the defaults settle in. It takes about five minutes, the menu paths are exact, and there's one important caveat Apple doesn't give you an off switch for. Here's the full checklist.

First, the fine print on who this applies to: Siri AI requires an iPhone 15 Pro or Pro Max, or an iPhone 16 or newer. It's English-only for now, not available in the EU on iOS 27 due to the Digital Markets Act, not available for Apple Accounts registered in mainland China, and not available for users under 13. Some Siri processing happens on-device; some goes to Apple's Private Cloud Compute — and there's no on-screen indicator telling you which requests go where. That's the backdrop. Now the controls.

Step 1: How to Limit Siri Access App by App

This is the main switchboard, and it lives in a slightly buried spot:

1. Open Settings > Apps, then tap an app's name — start with Messages, Mail, and Notes.
2. Tap Search.
3. Turn off Show Content in Search.

Per Apple's own support documentation, turning off either Show App in Search or Show Content in Search prevents Siri AI from finding personal context inside that app. In practice, kill both toggles for anything holding sensitive material. After the big three, work through your banking apps, health apps, workplace chat, and anything else you'd be uncomfortable seeing quoted back to you by an assistant.

This is per-app and a little tedious, but it's the highest-leverage five minutes in this whole guide. Defaults favor Apple's convenience; your job is to revoke the ones you didn't ask for.

Step 2: Check the Second Switch — Settings > Siri > App Access

Here's the part most guides miss: iOS 27 has a second, separate per-app menu at Settings > Siri > App Access. It is not confirmed to overlap with the Search toggles from Step 1 — they may control different things, or the same thing through different plumbing. Apple's documentation doesn't fully clarify the relationship.

So check both. Go through your sensitive apps in this menu too and restrict what you find. Redundant? Maybe. But when two menus might govern the same access, the safe move is to lock down both and let Apple sort out the deduplication. If you've ever done a broader app-permissions audit on iPhone or Android, treat this as the Siri-specific sequel.

Step 3: The iOS 27.2 Shortcut — Excluded Apps

If you're running the iOS 27.2 beta (the full release is expected in late October — see our coverage of the iOS 27.2 release timing), Apple renames this panel to Excluded Apps and lets you exclude multiple apps at once instead of tapping through them one by one.

This is the version of the feature that should have shipped in 27.0. If you're not on the beta, it's worth knowing it's coming — your per-app work now carries over, and bulk exclusion will make future cleanups much faster.

The Caveat Nobody Mentions: On-Screen Awareness

Now the bad news. iOS 27's on-screen awareness lets Siri read whatever is currently on your display — including the contents of Signal or WhatsApp chats — to answer questions with context. There is no per-app off switch for this. You cannot tell Siri "read my screen, except when I'm in Signal."

Worse, requests involving on-screen content may be sent to Private Cloud Compute for processing, and as noted above, iOS gives you no indicator of when that happens. The only reliable moves:

• Know it exists. Don't dictate sensitive questions to Siri while a private conversation is on screen.
• Use the Apple Intelligence Report (Settings > Privacy & Security) to audit what your device actually sent to Private Cloud Compute. It's the closest thing to a receipt Apple provides — review it periodically.

This is the one area where "limit Siri access" hits a wall Apple built on purpose. On-screen awareness is core to the Siri AI pitch, and Apple clearly decided a per-app kill switch would undermine it. Reasonable people can disagree; what's not reasonable is not knowing the switch doesn't exist.

What Those Other Toggles Actually Do

While you're in these menus you'll see two more toggles that sound relevant but aren't. Don't confuse them with access controls:

• Learn from this App — controls whether the app's usage patterns feed Siri's personalization. It affects how smart Siri acts, not what it can read.
• Suggest App / Show on Home Screen suggestions — controls whether Siri suggests the app to you. Suggestions are output; access is input. Turning off suggestions doesn't revoke a thing.

And if you want the nuclear option, it exists: you can turn off Siri — or Apple Intelligence entirely — from Settings. That's a legitimate choice, not a failure mode. An assistant you don't trust with your data is an assistant you shouldn't run.

The 5-Minute Checklist

Do this right after updating to iOS 27, in order:

1. Settings > Apps > Messages > Search — turn off Show Content in Search (and Show App in Search).
2. Repeat for Mail, Notes, then banking, health, and work apps.
3. Settings > Siri > App Access — restrict the same sensitive apps in this second menu.
4. On iOS 27.2, use Excluded Apps to bulk-exclude anything you missed.
5. Open the Apple Intelligence Report under Privacy & Security and check what's been sent to Private Cloud Compute.
6. Remember the on-screen awareness caveat: no per-app switch exists, so keep private chats off-screen when invoking Siri.

None of this is fear-mongering — Siri AI is genuinely useful, and Apple's on-device plus Private Cloud Compute architecture is more privacy-conscious than the alternatives. But defaults are choices Apple made for you, and five minutes of toggling is a cheap price for making them yours. If you want to go further, our guide to downloading your data from Apple, Google, and Meta shows you what these companies already hold — useful context for deciding what Siri gets to read next.