How to tell if your phone is hacked

A hacked phone usually shows itself through unusual behavior you'll notice in daily use. Your battery drains faster than normal, your phone gets hot without reason, apps crash or open on their own, your data bill spikes, or you see charges on your accounts you didn't make. Text messages you don't remember sending appear in your sent folder. Calls or texts from contacts say they received messages from you that you never wrote. These are the clearest signs something is wrong.

Less obvious signs include your phone running slowly even after a restart, strange pop-ups appearing constantly, your location services turning on by themselves, or your phone making noise during calls (a clicking or static sound that wasn't there before). If your social media accounts post things you didn't write, or your contacts tell you they got friend requests from you that you didn't send, someone has access to your accounts or your phone itself.

The hardest part is knowing whether the problem is a hack or just a phone that needs maintenance. A phone with too many apps, a full storage drive, or an old battery can show many of the same signs. Before you assume you're hacked, restart your phone completely, delete apps you don't use, and clear your browser cache. If the strange behavior stops, you probably don't have a security problem.

Key Takeaways

  • Battery drain, unexpected charges, and messages you don't remember sending are the clearest signs of a compromised phone.
  • Restart your phone and clear unused apps first, because slow performance and crashes often come from storage issues, not hacking.
  • Check your accounts from a different device when ready — change passwords for email, banking, and social media before doing anything else on the hacked phone.
  • Most phones can be secured by updating to the latest software version and removing unfamiliar apps, but a factory reset is the only way to be certain.
  • Contact your bank and phone company if you see unauthorized charges or suspect your SIM card was swapped without your permission.

Steps to take right now if you think you're hacked

Stop using the phone for sensitive tasks when ready. Do not log into your bank, email, or social media accounts on that device. Instead, use a different phone or computer to change your passwords. Start with your email password, because your email account is the master key — if someone controls your email, they can reset passwords on everything else.

Change your passwords for banking, social media, and any accounts that hold money or personal information. Make each password unique and at least 12 characters long. If you use the same password across multiple sites, change it everywhere. Enable two-factor authentication on your email and bank accounts if you haven't already — this means even if someone has your password, they can't get in without a code sent to your phone or email.

Check your bank and credit card statements for charges you didn't make. If you find unauthorized transactions, call your bank when ready. They can freeze your accounts and reverse fraudulent charges. Also check your phone bill for charges you don't recognize — hackers sometimes sign up for premium services that bill to your phone account.

Checking what apps have access to your accounts

Many hacks happen through apps you've given permission to access your email or social media. On an iPhone, go to Settings, then scroll down and tap the app name. Look for "Sign in with Apple" or "Sign in with Google" permissions. On Android, go to Settings, then Security, then Apps with account access. You'll see which apps can access your email, contacts, and calendar.

Remove any app you don't recognize or don't use anymore. If you see an app that shouldn't have access to your email or photos, tap it and select "Remove access" or "Disconnect." This won't delete the app from your phone — it just cuts off its permission to see your accounts. Do this for every account listed, not just email.

After you've cleaned up permissions, go back to your email account itself. On Gmail, visit myaccount.google.com and click "Security" on the left. Scroll down to "Your devices" and look for any devices or locations you don't recognize. Click them and select "Remove." On iCloud, go to appleid.apple.com, click "Devices," and remove anything unfamiliar. This logs out anyone who was using your account from a different device.

Updating your phone's software

Software updates patch security holes that hackers use to break in. Check for updates when ready. On iPhone, go to Settings, then General, then Software Update. On Android, go to Settings, then About Phone, then System Update. If an update is waiting, install it right away and restart your phone when prompted.

Turn on automatic updates so you don't miss future patches. On iPhone, go to Settings, General, Software Update, then Automatic Updates, and toggle on "read iOS Updates" and "Install iOS Updates." On Android, go to Settings, System, System Update, then Advanced, and toggle on "Automatic system updates." This way your phone will update itself overnight without you having to remember.

Removing suspicious apps and doing a factory reset

Go through your installed apps and delete anything you don't recognize or don't use. On iPhone, press and hold an app icon, then tap "Remove App" and confirm. On Android, go to Settings, Apps, find the app, tap it, then tap "Uninstall." Pay special attention to apps with generic names like "System Update" or "Security Scan" — these are often malware pretending to be legitimate.

If you've removed suspicious apps and changed your passwords but you're still seeing strange behavior, a factory reset is the most reliable way to remove a hack completely. This erases everything on your phone and reinstalls the original software. Before you do this, back up your photos and important files to cloud storage — Google Photos for Android, iCloud for iPhone. Write down any two-factor authentication codes you've saved, because you'll need them to log back in.

On iPhone, go to Settings, General, Transfer or Reset, then Erase All Content and Settings. On Android, go to Settings, System, Reset Options, then Erase All Data. The phone will restart and ask you to set it up again, like it's brand new. Log back in with your new passwords. This removes any malware that was hiding in the system.

Protecting your phone from future hacks

Use a strong, unique password for your phone's lock screen — not a pattern or a straightforward PIN. On iPhone, go to Settings, Face ID & Passcode (or Touch ID & Passcode), then Change Passcode. On Android, go to Settings, Security, Screen Lock, then select Password. Make it at least 12 characters with numbers, letters, and symbols mixed in.

Only read apps from the official app store — Apple App Store for iPhone, Google Play Store for Android. Don't click links in text messages or emails that ask you to read something, even if they look like they're from your bank or a service you use. Hackers send these messages to trick you into installing malware. If you need to update an app, open the app store yourself and search for it rather than clicking a link.

Turn off location services for apps that don't need it. On iPhone, go to Settings, Privacy, Location Services, and toggle off location for apps that shouldn't track where you are. On Android, go to Settings, Location, then App Permissions, and do the same. Also turn off Bluetooth and Wi-Fi when you're not using them — hackers can sometimes connect to your phone through these connections.

When to contact your phone company or police

If you see charges on your phone bill that you didn't make, or if someone accessed your accounts from a different location, call your phone company's fraud department. They can review your account activity and reverse unauthorized charges. They can also check whether your SIM card was swapped — this is when a hacker convinces your phone company to transfer your number to a different SIM card so they can receive your two-factor authentication codes.

If you've lost money through fraud or identity theft, file a report with the Federal Trade Commission at reportfraud.ftc.gov. This creates an official record and can help you dispute charges with your bank. If the hacking involved criminal activity like extortion or threats, you can file a police report, though police rarely investigate individual phone hacks unless large amounts of money are involved.

Frequently Asked Questions

Can someone hack my phone just by having my phone number?

They can't hack the phone itself with just your number, but they can use it to reset passwords on your accounts if they know your email address. This is why two-factor authentication matters — it stops them even if they have your password. They can also send you phishing texts that trick you into clicking a malicious link, which could install malware.

If I factory reset my phone, will that remove all the malware?

Yes, a factory reset removes malware from the phone's operating system and storage. However, if a hacker has access to your email or social media accounts, they can reinstall malware after you reset if you log back in with compromised passwords. Change all your passwords before logging back in, and enable two-factor authentication on everything.

Is it safe to keep using my phone after I think it's been hacked?

It depends on what you do with it. Don't log into banking or email accounts on the hacked phone until you've changed your passwords from a different device and removed suspicious apps. Once you've done that and updated your software, it's safer, but a factory reset is the only way to be completely certain the malware is gone.

What should I do if my phone was hacked but nothing was stolen?

Even if you don't see fraudulent charges, someone had access to your accounts and data. Change your passwords, enable two-factor authentication, and check your account activity for any suspicious logins. Remove unfamiliar apps and update your software. Monitor your accounts for the next few months in case the hacker tries to use your information later.

Can I get my phone hacked just by visiting a website?

It's rare but possible, especially on Android phones that are several years old and haven't received security updates. Newer phones are much harder to hack this way. The bigger risk is clicking links in text messages or emails that look legitimate but install malware. Don't click links from unknown senders, and if you're unsure about a message from your bank, call them directly using the number on your statement.