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Start with safety, then harden both the phone and the accounts connected to it. Install current operating-system updates, use a unique device passcode, secure your Apple or Google account and email with strong unique passwords and two-factor authentication, and review apps, permissions, connected devices, location sharing, and account access. On iPhone, Safety Check can guide much of this review; on Android, Google Play Protect can check apps for harmful behavior.
No battery drain, unfamiliar app, or other single symptom proves surveillance. If monitoring may be tied to stalking, abuse, or coercive control, changing settings or deleting an app can alert the person responsible. Use a safer device to contact a domestic-violence or digital-safety advocate and make a plan before technical cleanup.
What spyware and stalkerware can expose
Spyware is software or an account compromise that collects information without meaningful consent. Stalkerware is commonly used in technology-enabled abuse and may expose a phone’s location, calls, text messages, email, photos, or other activity. Some products also seek microphone or camera access. Capabilities depend on the app, the permissions it receives, the operating-system version, and whether the person monitoring also controls an online account.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsA phone can therefore be secure while an Apple Account, Google account, email account, messaging service, or location-sharing relationship remains accessible to someone else. Device checks and account checks answer different questions. A clean app list does not prove that nobody can sign in to an account, and an unfamiliar app does not by itself identify who has access or what they can see.
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Highly sophisticated targeted spyware is a separate threat model from routine stalking concerns. Apple describes mercenary spyware as an uncommon attack aimed at individually selected people, such as journalists, activists, officials, or other high-risk targets. The ordinary steps in this guide are still the right baseline, but people facing credible targeted attacks should also follow Apple’s official threat-notification guidance and consider Lockdown Mode.
Put personal safety before technical changes
If the suspected monitoring is connected to an abusive partner, ex-partner, family member, or stalker, do not begin by confronting that person or abruptly uninstalling software. The Federal Trade Commission (FTC) warns that removing stalkerware can alert an abuser and may escalate danger.
- Use a device the suspected person cannot access. A trusted friend’s phone, a library computer, or another safe device may be more appropriate than the phone you are investigating. The FTC notes that a different phone can be safest in some situations, but the right choice depends on your circumstances.
- Contact a domestic-violence advocate or qualified digital-safety professional. Ask about immediate safety, evidence preservation, account changes, and whether professional or law-enforcement assistance is appropriate in your area.
- Decide what evidence matters before deleting anything. Screenshots, dates, messages, account notifications, and device information may be useful, but collecting evidence can itself create risk. Follow the advocate’s advice and do not store sensitive notes where the suspected person can see them.
- Plan for the reaction to each change. A password reset, location-sharing change, app removal, factory reset, or new phone may be visible to another person. Make changes when you have a safe place, transportation, support, and a way to communicate.
FTC consumer guidance is written for a U.S. audience. People elsewhere should use an equivalent local support service, emergency service, or domestic-violence organization.
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Harden the phone and the accounts around it
Install operating-system updates
Update iOS or Android when it is safe and practical. Current software includes security fixes and keeps built-in safety features available. Turn on the platform’s automatic update option if that fits your safety plan, and restart the phone when an update requires it.
Use a unique device passcode
Replace a passcode that another person knows, has guessed, or may have seen. Do not reuse a passcode used for an account, payment card, alarm, or another device. Enable biometrics where appropriate, but keep a passcode that only you know. A strong device passcode protects the handset; it cannot revoke access to an account that someone else still controls.
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Secure the primary account and email
Change the password for the Apple Account or Google account associated with the phone, plus the main email account and any service that can reset other passwords. Use a different strong password for every account. Enable two-factor authentication and review the verification phone numbers, recovery email addresses, authenticator devices, and signed-in sessions. Remove devices and sessions you do not recognize only when doing so will not create an immediate safety risk.
Account security is especially important when someone has had physical access to the phone. An attacker may not need a hidden app if they can read synchronized mail, photos, messages, or location history from another signed-in device.
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Check who can see your location, photos, calendars, files, and other shared information. Review connected devices in the Apple Account or Google account, as well as sharing inside social, messaging, cloud-storage, and family services. Those services may not appear in the phone’s built-in safety review.
Use Safety Check on an iPhone
Apple’s Safety Check requires iOS 16 or later. Open Settings > Privacy & Security > Safety Check. The feature has two routes:
Manage Sharing & Access
This guided review lets you inspect information shared with people and apps, connected Apple Account devices, verification phone numbers, app privacy permissions, and account or device credentials. Work through each item and stop if a change could alert someone or remove support you need.
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Emergency Reset
Emergency Reset is intended for a rapid review of sharing and access. It can help you stop sharing with people and review devices, verification numbers, and account security in one flow. Use it only when you understand the consequences and have considered personal safety.
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Safety Check is not a universal spyware detector. It does not cover every non-Apple account, social-media service, or device signed in to another Apple Account. Inspect those accounts separately, and review location sharing within each service that can expose it.
Use Google Play Protect on Android
Google Play Protect checks apps from Google Play before download and also checks apps installed from other sources. Depending on what it finds, it may warn you, deactivate an app, remove a harmful app, or reset some permissions. Confirm that it is enabled and read any alerts it presents. Menu names vary by Android version and manufacturer; a common route is Settings > Security and privacy > Google Play Protect.
Play Protect is a useful protective layer, not forensic proof that a phone is clean. It focuses on harmful app behavior and cannot determine whether another person knows your account password, has access through a legitimate app, or is monitoring you from a different signed-in device. Check account sessions, sharing settings, and permissions separately.
Review apps and powerful permissions carefully
Open the complete installed-app list and inspect permissions for location, contacts, messages, phone, microphone, camera, files, and notifications. Also review:
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- Accessibility access, which can allow an app to read or act on what appears on screen.
- Device-administrator access, which can give an app control over security or removal settings.
- VPN configurations and profiles, which can route or filter traffic.
- Unknown installation sources and work or management profiles.
Exact labels differ by manufacturer and Android version. On iPhone, review app permissions through Settings > Privacy & Security and inspect profiles or device-management entries if your device displays them.
Do not delete an app solely because its name looks strange. System components can have unfamiliar names, and a monitoring app may disguise itself. In its 2021 SpyFone enforcement action, the FTC described a product that could appear as “System Service.” Samuel Levine, then Acting Director of the FTC’s Bureau of Consumer Protection, called SpyFone “a brazen brand name for a surveillance business that helped stalkers steal private information.” A suspicious name is a reason to investigate safely, not reliable proof by itself.
If you find an app that you believe is dangerous, first consider whether removing it could notify the person who installed it, destroy evidence, or trigger retaliation. An advocate can help decide whether to document it, disable a permission, remove it, or leave it in place temporarily.
Interpret symptoms without treating them as proof
Unexpected battery drain, heat, mobile-data use, crashes, unfamiliar icons, changed settings, or a phone that wakes unexpectedly can have many ordinary causes, including an aging battery, a software update, poor signal, or a legitimate app. These signs justify a structured review, but none establishes surveillance.
Look for corroborating facts instead: an account session you cannot explain, a sharing relationship you did not create, an app with an inappropriate high-risk permission, or a security notification from Apple or Google. Avoid downloading an unverified “spyware detector” or granting broad permissions to a new security app merely because it promises certainty. No built-in check guarantees detection of every form of monitoring.
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Recognize Apple’s high-risk threat notifications
Apple says a threat notification is a high-confidence alert that it believes a person has been individually targeted by mercenary spyware. A genuine notification appears on the device. Apple says it will not ask you by email or phone to click a link, open a file, install an app or profile, or provide an Apple Account password or verification code.
Treat a notification seriously and follow Apple’s official instructions rather than responding to a message that imitates Apple. If you have good reason to believe you are being individually targeted but have not received a notification, Apple recommends considering Lockdown Mode.
When Lockdown Mode makes sense
Lockdown Mode is an additional defensive measure for people who may face highly sophisticated targeted attacks. It changes or restricts some device features to reduce possible attack surface, which can make everyday use less convenient. It is not the routine first step for every concern about location sharing, a controlling partner, or an unfamiliar app.
Choose it with a clear threat model and, where possible, advice from a qualified professional. Lockdown Mode does not replace account-password changes, two-factor authentication, app and sharing reviews, or personal-safety planning.
Should you factory-reset the phone?
A factory reset can remove some unwanted software, but it is not a guarantee. It may leave shared-account access untouched, restore risky settings or apps from a backup, destroy evidence, or alert the person monitoring the device. A reset also does not tell you whether another person still knows your Apple Account, Google account, or email password.
If a reset is being considered:
- Consult an advocate or digital-safety professional first when abuse or stalking is involved.
- Preserve evidence that you may need, following professional advice.
- Secure accounts from a safer device and remove unrecognized sessions before relying on the reset.
- Plan for the reset’s effect on communication, transportation, authentication, work, and emergency contacts.
- Afterward, reinstall only what you need and continue checking account access and sharing.
A new phone can be an individualized safety measure when the old device cannot be trusted, but it is not a routine product recommendation and does not solve an account that another person still controls. Use a safe setup process and do not restore access or data in a way that reintroduces the problem.
iPhone Safety Check, Android Play Protect, and Lockdown Mode compared
| Tool | Primary purpose | What it can do | Important limit |
|---|---|---|---|
| iPhone Safety Check | Review sharing, permissions, and Apple Account or device access | Offers Manage Sharing & Access and Emergency Reset; reviews shared information, connected devices, verification numbers, app permissions, and credentials | Requires iOS 16 or later and does not cover every non-Apple account, social service, or device using another Apple Account |
| Google Play Protect | Check Android apps for harmful behavior | Checks Google Play apps before download and apps from other sources; may warn, deactivate, remove, or reset permissions for some harmful apps | It is not a complete spyware detector and does not establish who controls an account or sharing relationship |
| Apple Lockdown Mode | Reduce exposure to highly sophisticated targeted attacks | Adds restrictions intended for people who may face mercenary spyware or similar high-risk targeting | It is not the routine response to ordinary tracking concerns and can reduce convenience |
| Safety-planning support | Manage personal risk while investigating or changing access | Helps weigh retaliation, evidence, account changes, device replacement, and professional assistance | Technical settings alone cannot assess the danger posed by a particular person |
A practical decision path
If there is no immediate danger
- Update the operating system.
- Set a unique device passcode and review biometric access.
- Change primary-account and email passwords to unique values and enable two-factor authentication.
- Review signed-in devices, recovery methods, location sharing, and connected services.
- Run Safety Check on iOS 16 or later, or review Play Protect and Android permissions.
- Investigate unfamiliar apps or profiles without deleting them impulsively.
If the suspected person may retaliate
- Stop making changes on the monitored phone until you have advice.
- Use a trusted device to contact an advocate.
- Discuss evidence, account security, communication, and whether a different phone is safer.
- Make technical changes in a planned sequence with support available.
If Apple sends a threat notification
- Verify that the alert is displayed on the device and does not ask for credentials or link clicks.
- Follow Apple’s official threat-notification instructions.
- Consider Lockdown Mode if Apple’s threat model applies to you.
- Secure all accounts and seek qualified assistance; do not assume the notification covers every account or device.
Scope and source dates
The iPhone procedures come from Apple Support guidance for Safety Check and Apple’s safety guides, including material published in October 2024. Google’s Play Protect behavior and Android menu labels can vary by operating-system version and manufacturer. Apple’s mercenary-spyware and threat-notification guidance was published August 13, 2026. FTC consumer advice on stalkerware was updated June 30, 2026 in the cited search result and is U.S.-focused.
There is no reliable universal statistic showing how many phones contain stalkerware or how accurately a scanner detects it. The safest conclusion is practical: harden the device and every account around it, use built-in checks with realistic expectations, and put personal safety ahead of abrupt cleanup when another person may be watching.
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