Is Your Phone Hacked? 11 Warning Signs and Fixes

11 warning signs your phone is hacked and how to fix each one

Short answer: Most "is my phone hacked?" worries turn out to be an aging battery or a misbehaving app. The signs worth taking seriously are apps you didn't install, unknown device-management profiles, messages or calls you didn't send, sudden loss of mobile service, and account alerts you can't explain. Check for those first, update your phone, remove anything suspicious, and secure your accounts from a different device. If you suspect someone close to you installed stalkerware, plan your next steps carefully before removing it.

The 11 warning signs, ranked by how much they matter

Sign	How seriously to take it	Common innocent cause
Apps you didn't install	High	Pre-installed carrier apps
Unknown configuration or device-management profile	High	Work/school phone
Texts or calls you didn't send	High	Rarely innocent
Sudden "No service" and you can't make calls	Urgent — possible SIM swap	Network outage
Password-reset or login alerts you didn't trigger	High	Someone mistyping their email
Accessibility or admin permissions granted to unknown apps (Android)	High	Legitimate apps you forgot
Camera/microphone indicators lighting up unexpectedly	Medium	An app you have open in the background
Unexplained data usage spikes	Medium	Cloud photo backup, updates
Battery drain and heat while idle	Low–medium	Old battery, background app
Pop-ups and browser redirects	Medium (usually adware)	Malicious website, not the phone
Phone running slowly	Low	Storage nearly full, old device

Check your iPhone

Update iOS (Settings → General → Software Update).
Check profiles: Settings → General → VPN & Device Management. Remove anything you don't recognize (unless it's from your employer).
Review apps in Settings → [app list], and delete unknown ones.
Run Safety Check (Settings → Privacy & Security → Safety Check) to review who you share location and data with and which devices are signed in to your Apple ID.
Check your Apple ID devices (Settings → your name) and remove unknown ones.
High-risk users (journalists, activists) can enable Lockdown Mode.

Check your Android phone

Update Android and Google Play system updates.
Run Google Play Protect (Play Store → profile → Play Protect).
Review apps (Settings → Apps) and remove unknown ones.
Check special access: Settings → Security → Device admin apps, and Accessibility services — spyware often hides here.
Review Google account devices at myaccount.google.com → Security → Your devices.
Avoid sideloading apps from outside the Play Store.

Signs of a SIM swap (act fast)

If your phone suddenly shows "No service" or "SOS only" where it normally works, and you start getting password-reset emails, your number may have been moved to an attacker's SIM:

Call your carrier from another phone immediately.
Ask them to restore your number and add a port-out PIN or SIM lock.
Change your email password and switch accounts from SMS codes to an authenticator app or passkeys.

If you suspect stalkerware

Stalkerware is often installed by someone with physical access to the phone, such as a partner or family member. Removing it can alert that person. If you're in an abusive situation, consider contacting a domestic violence support service first; resources like the Coalition Against Stalkerware explain safe options. Using a different, safe device to seek help is important.

Fixing a compromised phone

Back up photos and essential data (not apps or settings that could reinstall the problem).
Remove suspicious apps and profiles.
Change passwords for email, Apple ID/Google account, banking and social media — from a different, trusted device. Turn on two-factor authentication.
Factory reset if problems persist, then set up as new and reinstall apps from the official store.
Watch account activity for a few weeks.

Prevention

Keep the phone updated and use a strong passcode.
Install apps only from official stores and check permissions.
Don't click links in unexpected texts.
Use a password manager and passkeys.
Add a SIM/port-out PIN with your carrier.

Frequently asked questions

Can my phone be hacked by visiting a website?

Rarely on an up-to-date phone. Most "hacked" warnings on websites are scams; close the tab and don't install anything they suggest.

Does a factory reset remove hackers?

It removes malicious apps and settings in nearly all cases. Afterwards, change your account passwords so the attacker can't regain access through your accounts.

Can someone hack my phone through a text?

Clicking links in scam texts can lead to phishing sites or malicious downloads. Rare "zero-click" attacks target high-risk individuals; Lockdown Mode on iPhone helps protect them.

Sources

Apple, Safety Check for iPhone
Apple, About Lockdown Mode
Google, Google Play Protect
Coalition Against Stalkerware, Resources for survivors
FCC, Cell phone fraud: SIM swapping and port-out scams

Is Your Phone Hacked? 11 Real Warning Signs and How to Fix Each One