iPhone viruses are rare, but you can check your device's security status in Settings

iPhones rarely get viruses because Apple's operating system isolates apps from each other and from the core system. A virus cannot spread from one app to another or modify iOS itself the way viruses work on other devices. That said, you can still check your iPhone's security posture through Settings to see whether your device has been compromised, whether you have installed a problematic app, or whether your account has been accessed without permission.

The most useful security checks happen in three places: the App Store's purchase history, your Apple ID security settings, and your device's storage and app management screens. None of these will scan for a traditional virus, but together they show you whether something unusual has happened to your phone.

Key Takeaways

  • Open Settings, tap your name at the top, then tap Password & Security to see all devices signed into your Apple ID and check for unfamiliar logins.
  • Go to Settings > General > iPhone Storage to see which apps are installed and how much space each one uses, which can reveal unwanted apps you did not download.
  • Check the App Store app, tap your profile icon in the top right, then tap Purchase History to see every app ever installed on your account.
  • Restart your iPhone by holding the power button and volume button together, then sliding to power off — this clears temporary files and stops most malicious processes.
  • If you see an app you did not download or a device you do not recognize, delete the app or sign out of that device immediately from Settings.

Check which devices are signed into your Apple ID

Your Apple ID is the gateway to your iPhone. If someone else has access to it, they can install apps, change your password, or lock you out of your device. Open Settings and tap your name at the very top of the screen. Then tap Password & Security.

You will see a list called "Where You're Signed In" that shows every device currently logged into your Apple ID. Look for devices you do not recognize — an iPad you never owned, a Mac you did not buy, or a device with a name that does not match anything you use. If you see something unfamiliar, tap it and select Remove. This signs that device out of your account immediately.

Also check the "Security" section on this same screen. If you see a notification that says your account was accessed from an unusual location, or if you see a login attempt you did not make, your account may have been compromised. Change your Apple ID password right away by tapping "Change Password" on this screen.

Review your app purchase and installation history

Every app you have ever installed on your iPhone is recorded in your App Store purchase history, even if you deleted it. Open the App Store app and tap the profile icon in the top right corner. Then tap Purchase History.

Scroll through the list and look for apps you do not remember downloading. Pay special attention to apps with names that sound generic or vague, or apps that claim to do something you never asked for — "System Cleaner," "Battery Saver," "Security Boost," or similar. These are common names for apps that may behave unexpectedly or display excessive ads.

If you find an app you did not install, it may have been added to your account by someone with access to your Apple ID, or it may have been installed by a family member if you share an account. Either way, you can delete it from your device. Tap the app name in Purchase History, then tap the cloud icon with a minus sign to remove it from your device.

Look at what is currently installed on your device

Open Settings and go to General > iPhone Storage. This screen shows every app installed on your phone, sorted by size. Scroll through and look for apps you do not recognize or do not remember installing.

Pay attention to apps that take up unusual amounts of space for what they claim to do. A simple note-taking app should not use 500 megabytes. A calculator should not use 200 megabytes. Large file sizes can indicate that an app is storing data or running processes in the background that you did not authorize.

If you find an app that looks suspicious, tap it and select "Offload App" first. This removes the app but keeps your data in case you need it later. If nothing changes on your phone after a few days, go back and tap "Delete App" to remove it completely.

Check your iPhone's battery and background activity

A virus or malicious app often drains your battery faster than normal because it is running processes in the background. Open Settings and go to Battery. Tap Battery Health & Charging to see your battery's maximum capacity.

If your battery capacity is still above 80 percent but your phone dies much faster than it used to, something is using power in the background. Go back to Settings > General > iPhone Storage and look for apps that are using a lot of space or that you do not recognize.

You can also check which apps are using the most battery. Go to Settings > Battery and look at the list under "Battery Usage by App." If an app you rarely use is at the top of the list, it may be running constantly in the background. Consider deleting it.

Restart your iPhone to clear temporary files

Restarting your iPhone clears temporary files from memory and stops any processes that are currently running. This is one of the most effective ways to stop a malicious app from doing damage while you investigate.

To restart, hold down the power button and the volume down button at the same time. Keep holding until you see the "Slide to Power Off" screen. Drag the slider to the right to turn off your phone. Wait 10 seconds, then press the power button again to turn it back on.

After your phone restarts, check whether the problem you noticed — slow performance, rapid battery drain, unexpected data usage — has improved. If it has, the issue was likely a temporary glitch. If the problem returns immediately, a specific app is probably causing it.

What to do if you find something suspicious

If you found an unfamiliar app, an unknown device on your account, or signs that someone else has accessed your phone, take these steps in order.

First, change your Apple ID password immediately. Go to Settings > [Your Name] > Password & Security > Change Password. Use a password that is at least 16 characters long and includes uppercase letters, lowercase letters, numbers, and symbols.

Second, delete any apps you do not recognize. Go to Settings > General > iPhone Storage, find the app, tap it, and select "Delete App."

Third, sign out any unfamiliar devices from your Apple ID. Go to Settings > [Your Name] > Password & Security > Where You're Signed In, tap the device, and select Remove.

Fourth, turn on two-factor authentication if you have not already. Go to Settings > [Your Name] > Password & Security and make sure "Two-Factor Authentication" is turned on. This prevents anyone from accessing your account even if they know your password.

Frequently Asked Questions

Can iPhones actually get viruses?

Traditional viruses that spread from app to app cannot run on iPhones because each app is isolated from the others and from iOS itself. However, a malicious app can still cause problems — it can drain your battery, display unwanted ads, steal your data, or access your location. These are not viruses, but they are still harmful.

What does it mean if I see an unfamiliar device in my Apple ID settings?

It means someone has signed into your Apple ID on that device. This could be a family member, a friend who borrowed a device, or someone who has your password. Tap the device and select Remove to sign it out immediately. Then change your Apple ID password.

Should I factory reset my iPhone if I think it has a virus?

A factory reset erases everything on your phone and reinstalls iOS from scratch. It is the most thorough way to remove any malicious app, but you should try deleting suspicious apps first. If the problem continues after you delete apps and restart your phone, then consider a factory reset. Go to Settings > General > Transfer or Reset > Erase All Content and Settings.

How do I know if an app is using too much battery?

Go to Settings > Battery and look at the list under "Battery Usage by App." Apps you use frequently will naturally be at the top. But if an app you rarely open is using 10 percent or more of your battery, it is running constantly in the background. Consider deleting it and seeing whether your battery life improves.

What should I do if I see a login attempt I did not make?

Change your Apple ID password immediately by going to Settings > [Your Name] > Password & Security > Change Password. Then go to Password & Security > Where You're Signed In and review every device. Remove any device you do not recognize. Turn on two-factor authentication if it is not already on.