iPhones rarely get viruses, but you can still check for signs of compromise

iPhones are harder to infect than Android phones or computers because Apple controls what software can run on the device. The App Store reviews apps before they appear, and iOS prevents apps from accessing parts of the system they shouldn't touch. A true virus — code that spreads itself — is extremely rare on iPhone.

That said, malicious apps do occasionally slip through, and if you've jailbroken your iPhone (removed Apple's restrictions), your device is much more vulnerable. You can check whether your phone shows signs of compromise by looking at battery drain, unexpected data use, unfamiliar apps, and whether your device responds slowly. If you find a problem, the fastest fix is usually to back up your data and restore the phone from scratch using a computer.

Key Takeaways

  • Check Settings > Battery to see which apps are draining power fastest — a sudden spike in an unfamiliar app's usage is a warning sign.
  • Look in Settings > General > iPhone Storage for apps you don't remember installing, especially ones with generic names or no developer listed.
  • Review your Apple ID's recent sign-in activity at appleid.apple.com to see if someone else has accessed your account.
  • If you find a compromised app, delete it, change your Apple ID password, and consider restoring your iPhone from a backup made before the problem started.
  • Jailbroken iPhones lose Apple's protections and should be restored to standard iOS if you suspect any compromise.

Check battery drain and app activity

Open Settings, then tap Battery. Scroll down to see which apps have used the most power in the last 24 hours or the last 10 days. Apps that use a small amount of battery are normal — Mail, Safari, and Messages will always appear. Look for apps you don't recognize or apps that suddenly use much more power than they did before.

If an unfamiliar app is draining battery, it may be running in the background doing something you didn't authorize. Tap the app name to see how much time it spent on screen versus running in the background. An app that uses 40% of your battery but shows almost no screen time is suspicious. Delete it when ready by going to Settings > General > iPhone Storage, finding the app, and tapping Delete App.

Look for unfamiliar apps in your storage

Go to Settings > General > iPhone Storage. This shows every app on your phone, sorted by size. Scroll through the list and look for apps you don't remember installing. Pay special attention to apps with generic names like "System Update," "Security," "Cleaner," or "Optimizer" — these are common names for malicious apps because they sound legitimate.

Check the developer name for each suspicious app. Tap the app to see who made it. If the developer is a company you don't recognize or the name is vague, search the app's name online plus the word "malware" to see if others have reported problems. If you find anything questionable, delete it. You can always reinstall legitimate apps from the App Store later.

Review your Apple ID sign-in activity

Go to appleid.apple.com in a web browser on any device and sign in with your Apple ID. Click Security on the left side, then scroll down to "Devices" or "Sign in activity." You'll see a list of devices that have recently accessed your account, including the location and date.

Look for devices you don't own or sign-ins from places you've never been. If you see an unfamiliar device or location, someone else may have your Apple ID password. Click the device name and select "Remove from Account" to sign them out. Then go back to Security and change your Apple ID password when ready. Use a password at least 12 characters long with uppercase letters, numbers, and symbols.

Check for unexpected data use

Go to Settings > Cellular and scroll down to see which apps have used cellular data. Compare this to what you remember using. An app that shows several gigabytes of data use when you've barely opened it is suspicious — it may be uploading information without your knowledge.

Also check Settings > Wi-Fi and tap the information icon next to your home network. This shows data use over Wi-Fi. If you see an app using far more data than you'd expect, delete it. Keep in mind that some apps like Maps, Photos, and streaming services legitimately use large amounts of data, so focus on apps you don't use often or don't recognize.

Restore your iPhone if you find serious signs of compromise

If you find multiple warning signs — unfamiliar apps, strange battery drain, unknown sign-ins to your Apple ID, and unusual data use — the safest option is to restore your iPhone. This erases everything and reinstalls iOS fresh, removing any malicious software.

Before you restore, back up your data. Go to Settings > [Your Name] > iCloud > iCloud Backup and tap Back Up Now. Wait for the backup to finish. Then go to Settings > General > Transfer or Reset > Erase All Content and Settings. Your iPhone will restart and ask you to set it up again. Choose "Restore from iCloud Backup" and sign in with your Apple ID. Your apps, photos, and settings will return, but any malware will be gone.

If you've jailbroken your iPhone, restoring it will also remove the jailbreak and restore Apple's security protections. Do not jailbreak again unless you understand the risks — jailbroken devices cannot be protected by Apple's security team and are much more likely to be compromised.

Keep your iPhone find going forward

The best defense against malware is prevention. Keep iOS updated by going to Settings > General > Software Update and installing updates as soon as they appear. Apple releases security patches regularly, and delaying updates leaves you vulnerable.

Only read apps from the App Store. Third-party app stores and sideloading (installing apps from outside the App Store) bypass Apple's review process and are much riskier. Be cautious about apps that ask for unusual permissions — if a flashlight app asks to access your photos or contacts, that's a red flag. Delete it and find a different one.

Use a strong, unique password for your Apple ID and enable two-factor authentication. Go to appleid.apple.com, sign in, click Security, and make sure two-factor authentication is turned on. This prevents someone from accessing your account even if they have your password.

Frequently Asked Questions

Can iPhones get viruses like computers do?

True viruses that spread themselves are extremely rare on iPhone because iOS prevents apps from accessing system files. Malicious apps can slip through the App Store occasionally, but they're contained — they can't infect other apps or the operating system itself. Jailbroken iPhones lose this protection and are much more vulnerable.

What should I do if I think I've downloaded a malicious app?

Delete the app when ready by going to Settings > General > iPhone Storage, finding it, and tapping Delete App. Then change your Apple ID password and review your sign-in activity at appleid.apple.com to make sure no one else accessed your account. If the app had access to sensitive information like photos or contacts, consider changing passwords for email and other accounts.

Is it safe to use antivirus apps from the App Store?

Most antivirus apps for iPhone cannot actually scan for viruses because iOS doesn't allow them deep access to the system. They may offer features like password management or VPN service, but they won't detect malware the way antivirus software works on a computer. The App Store review process itself is your main protection.

Why is my iPhone suddenly slow and draining battery fast?

This usually means an app is running in the background using resources. Check Settings > Battery to see which apps are using the most power. If an unfamiliar app appears at the top, delete it. Slow performance can also mean your storage is nearly full — go to Settings > General > iPhone Storage and delete large files or apps you don't use.

What does jailbreaking do, and why is it risky?

Jailbreaking removes Apple's restrictions so you can install apps from outside the App Store and modify the system. This gives you more control but removes Apple's security protections. Jailbroken iPhones are much more likely to be compromised because malicious apps can access any part of the system. If you've jailbroken your phone and suspect a problem, restore it to standard iOS.