To enable iPhone’s Impersonation Risk Detection, go to Settings > Privacy & Security > Impersonation Risk Detection and turn on Share with App Developers. Apple says you may need to sign in to the App Store with your Apple Account. The feature is available starting with iOS 27, but it works only in apps that support it.
How do I turn on Impersonation Risk Detection?
- Open Settings on your iPhone.
- Tap Privacy & Security.
- Scroll down and tap Impersonation Risk Detection.
- Turn on Share with App Developers. If prompted, sign in to the App Store with your Apple Account.
Apple documents the setting in its About Impersonation Risk Detection article and the iPhone User Guide.
What does the iPhone anti-scam feature do?
When a supported app considers an action especially risky, it can ask iOS to assess signs of an active social-engineering scam. Apple gives payments and changes to important account security details, such as a password, as examples. The app receives a risk level and decides how to respond: it might show a warning, ask you to verify your identity, or add a delay.
Apple returns one of three categories: Unknown, Medium, or High. “Unknown” means iOS found no suspicious evidence for that assessment; it is not confirmation that the action is safe. Apple says the app uses the level to decide what to do and that Apple does not determine or control the app’s response.
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Where is the anti-scam setting, and why might it be missing?
The setting is under Settings > Privacy & Security. Apple says Impersonation Risk Detection is available starting with iOS 27 and iPadOS 27; the feature also depends on the app supporting it. Apple’s cited documentation does not specify eligible iPhone models or regional availability, so it does not establish a complete device or country checklist.
Turning on the setting does not make every app use it. It is an app-requested risk assessment, not a system-wide scan of every call, message, website, or payment, and it does not automatically block scams.
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What information does Apple say it uses?
Apple says the feature analyzes interaction patterns, timing, context, and basic sensor data on-device. According to Apple, it does not receive the data used to generate a risk level, does not analyze Photos, Messages, or Mail content for this feature, and shares only the resulting risk level with the requesting app. Apple also says it learns the type of action attempted when an app requests an assessment. These are Apple’s published privacy descriptions, not independent verification.
How to review or change app access
In the Impersonation Risk Detection settings, check Recent Activity to see apps that requested assessments. Open Reasons for Access to review the actions that prompted a request. You can select an app and turn off its access. Apple says a change to the overall setting or an individual app’s access may take up to 24 hours to take effect.
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Take care if someone tells you to disable the feature. Apple Support warns: “If someone directs you to turn this feature off, you might be the victim of a scam.”
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How this differs from other iPhone protections
These protections address different threats; enabling one does not make it a substitute for the others.
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| Protection | Threat addressed | Where it operates | What you may see |
|---|---|---|---|
| Impersonation Risk Detection | Possible social-engineering scam during a risky action in a participating app | An app requests an assessment from iOS | The app may warn you, request identity verification, or add a delay |
| Stolen Device Protection | Someone has your iPhone and knows its passcode | Device and Apple Account operations | For certain operations, Face ID or Touch ID is required with no passcode fallback; sensitive actions may also involve a one-hour security delay and a second biometric check. See Apple’s Stolen Device Protection guide. |
| iOS updates and Safari Safe Browsing | Software vulnerabilities and malicious web domains identified in the attacks Apple discusses | iOS security updates and Safari browsing | Apple recommends keeping iOS current and says Safari Safe Browsing is on by default and blocks the identified malicious URL domains. See Apple’s web-attack guidance. |
Apple’s published materials do not provide an independently measured detection rate, false-positive rate, or amount of fraud prevented for Impersonation Risk Detection. Treat its risk level as a signal to pause and evaluate an action, not as a guarantee.
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