Review advertising identifiers and privacy choices

Give your iPhone an advertising privacy review

An ad that follows your interests can make several settings seem like one problem. On iPhone, start with two separate decisions: whether other companies’ apps may track you across services, and whether Apple may personalize the advertising it delivers. Changing one does not settle the other.

This guide covers iPhone and the current iOS 27 documentation. You will review permissions in Settings, check the resulting switch positions, and understand what those choices leave outside their scope. You do not need to install a privacy utility or enter an advertising identifier into a website.

Choose your intended result before touching anything. A useful default for someone who wants less advertising personalization is to withdraw app tracking permissions, stop new tracking requests, and turn off Apple’s Personalized Ads. If you prefer to decide app by app, keep requests available and review each permission separately.

What happens to the advertising identifier?

The system advertising identifier, often called IDFA, helps identify a device for advertising purposes. Apple’s App Tracking Transparency explanation says an app denied tracking permission cannot access it. The developer is also prohibited from substituting identifying information such as your email address to perform that tracking.

That makes permission review the relevant action here. Avoid treating an online instruction to “reset your ad ID” as a reason to erase your iPhone or reset all its settings. Those would be much broader interventions than this task requires.

Keep three questions separate as you work: can this app track across other companies’ services; may Apple personalize its ads; and what information have I given a service directly? A shopping account with saved purchases deserves its own review even after you change the phone’s advertising controls. Do not record “all data deleted” when all you have done is withdraw a permission.

Review existing permissions before stopping requests

Open Settings → Privacy & Security → Tracking. Apple’s current tracking guide identifies this as the place to review apps that have requested permission.

1. Read the app names on the Tracking page. This is a list of tracking requests, not an inventory of every installed app or every kind of data collection.
2. For each listed app you do not want to allow to track, turn its permission off. Check the app name before changing the switch, especially if you have similarly named services.
3. If you want to stop future requests too, turn off Allow Apps to Request to Track at the top. Requests made while it is off are treated as denied.
4. If iOS offers a choice about apps previously allowed to track, choose to ask those apps to stop when that is your goal. Keeping earlier permissions would leave exceptions to your intended policy.

Reopen the Tracking page and check the result. For an individual review, confirm the intended app switches are off. For a broad refusal, confirm the master setting is off and that you did not deliberately retain earlier allowances. A quiet phone with no new prompts is not, by itself, a record of what you decided about existing permissions.

For a hypothetical example, suppose three listed apps have permission and you want to retain one exception. Review all three individually and leave only that chosen app allowed. If instead you want no exceptions, do not choose to keep earlier permissions when disabling requests. The important count is the permissions you intended to keep, not how many ads disappear afterward.

Make the separate Apple advertising choice

Return to Settings → Privacy & Security → Apple Advertising. Turn off Personalized Ads if you do not want Apple to use the covered information for ad personalization. Leave the page and return to verify the switch remains off.

Apple’s Advertising & Privacy notice explains that this setting concerns Apple’s advertising platform. It is separate from another company’s tracking permission. Expect neither switch to serve as an ad blocker: turning personalization off may leave the number of ads unchanged.

If available, tap View Ad Targeting Information on the Apple Advertising page to inspect information Apple may use for targeting. Treat that as an explanation to read, rather than proof that every advertiser has the same information or that every category can be edited there.

Context can still explain a relevant ad. For example, an App Store search may help select an advertisement during that session. An ad related to the search you just made is therefore not a reliable test of whether the Personalized Ads switch saved correctly. Use the setting itself as your immediate checkpoint.

When a setting is unavailable

A disabled tracking-request switch does not automatically mean something is broken. Apple documents restrictions for under-18 accounts, managed accounts or devices, and accounts created within the previous three days. Check which condition applies before attempting a repair.

For a work or school device, ask the administrator whether a management policy controls the setting. Do not remove its configuration profile just to make an advertising switch editable. For a newly created account, revisit after the documented restriction period if you still need to change the choice; signing out repeatedly is not a useful verification method.

Apple separately says Personalized Ads may be unavailable for minors, managed accounts, or locations where it does not deliver advertising in its apps. Note the unavailable control and its likely explanation. Do not change your age or account region to force it to appear.

If an app is absent from the Tracking list, there is no listed request to revoke there. Do not enable requests simply to provoke a prompt. Continue with the controls actually available, then review the service’s own privacy information if you need to understand its account-level practices.

Keep a useful record, and know how to reverse a choice

Write a short private note with the review date, whether tracking requests are off, any intentional app exceptions, and the Personalized Ads state. Record an unavailable setting as unavailable. This is more useful at your next review than “privacy fixed,” which hides what you actually checked.

To reconsider an app permission, return to Tracking. Enable requests if needed, then change the intended listed app’s permission or respond to its later request. Enabling requests is not a reason to approve every app. To reconsider Apple personalization, return to Apple Advertising and change Personalized Ads if available.

Apple says denying tracking does not prevent use of an app’s full capabilities. If a feature appears to fail afterward, check the actual error and the permission that feature needs before restoring tracking. Camera, microphone, location and other data permissions have their own controls, as Apple’s sharing and permissions overview explains.

Finish by distinguishing the completed review from unfinished work. These settings establish advertising choices; they do not demonstrate that old records were erased. If you want a service to delete information it already holds, pursue that service’s deletion controls separately. Keep your confirmed phone settings in place while you investigate.