What a phone virus actually is, and whether you have one
A virus on your phone is malicious software that copies itself and spreads to other files or devices. On Android phones, this usually means an app you installed that does something you did not consent to — stealing contacts, sending texts to premium numbers, displaying ads you cannot close, or collecting location data. On iPhones, actual viruses are extremely rare because Apple controls which apps can be installed and what they can access.
Most people who think they have a virus actually have adware (an app that shows constant ads) or spyware (an app collecting your data). Both are malicious, but the removal steps differ. Before you start, ask yourself: Did you install an unfamiliar app recently? Are ads appearing in places they should not? Is your phone running slowly or draining battery fast? Is your data usage suddenly high? If yes to any of these, you likely have a problem app rather than a virus.
Key Takeaways
- Most phone "viruses" are actually problem apps you installed yourself, often from outside the official app store.
- The first step is to restart your phone in Safe Mode, which disables third-party apps and lets you see if the problem stops.
- Uninstall any unfamiliar apps, apps with suspicious permissions, or apps you do not remember installing.
- If the problem persists after removing apps, factory reset your phone — this erases everything and reinstalls the operating system clean.
- On Android, avoid third-party antivirus apps; they often cause more problems than they solve and cannot remove viruses already running.
How to restart your phone in Safe Mode
Safe Mode disables all third-party apps — the ones you or someone else installed — while keeping the system apps that came with your phone. If your problem disappears in Safe Mode, you know a third-party app is the culprit.
On Android: Press and hold the power button until the power menu appears. Press and hold "Power off" until a "Safe Mode" option appears. Tap it. Your phone will restart with "Safe Mode" displayed at the bottom of the screen. Use your phone normally for a few minutes. If ads stop, battery drain stops, or the slowness goes away, a third-party app is the problem.
On iPhone: iPhones do not have a traditional Safe Mode, but you can restart and then when ready open Settings to check which apps have used location, camera, or microphone recently. Look for apps you do not recognize or do not remember using.
Finding and removing the problem app on Android
Once you know a third-party app is causing trouble, you need to find which one. Go to Settings, then Apps (or process Manager, depending on your phone). You will see a list of every app installed. Look for apps you do not recognize, apps with vague names like "System Update" or "Security," or apps you do not remember installing.
Check the install date if your phone shows it. Apps installed around the time your problems started are suspects. Tap each suspicious app and look at its permissions — what it is allowed to access. If a flashlight app is asking for permission to read your contacts or send texts, that is a red flag. Tap "Uninstall" to remove it.
If you cannot find an obvious culprit, look at which apps use the most battery or data. Go to Settings, Battery, or Settings, Data Usage. Apps that are using far more resources than they should are worth investigating. Remove anything you do not actively use.
What to do if uninstalling apps does not fix it
If you removed suspicious apps and the problem persists, the malicious software may have embedded itself deeper into your phone's system. At this point, a factory reset is the most reliable solution. This erases everything on your phone and reinstalls the operating system fresh, as if it came from the store.
Before you reset, back up anything you want to keep. On Android, go to Settings, Accounts, and make sure your Google account is synced — this saves your contacts, calendar, and photos to Google's servers. On iPhone, go to Settings, [Your Name], iCloud, and turn on iCloud Backup. Then go to Settings, General, Reset, and choose "Erase All Content and Settings." On Android, go to Settings, System, Reset Options, and choose "Erase all data."
Your phone will restart and walk you through setup. When you reinstall apps, read only from the Google Play Store (Android) or App Store (iPhone), and avoid apps with few reviews or suspicious permissions.
Why antivirus apps usually do not help
You may see ads for antivirus apps claiming they will scan and remove viruses. On Android, these apps cannot actually remove a virus that is already running — they can only scan files after the fact. More importantly, many antivirus apps themselves are adware or spyware, collecting your data or showing ads to make money. Google Play Protect, which comes built into Android, is free and more trustworthy than third-party antivirus apps.
If you want to scan for known problem apps, use Google Play Protect: go to Settings, Google, Manage your Google Account, Security, and scroll to "Google Play Protect." Tap "Scan." This checks your installed apps against a database of known malicious software. It will not remove a virus, but it will flag apps that are known to be dangerous.
How to avoid getting a virus in the first place
Most phone viruses come from apps installed outside the official app stores. Avoid downloading apps from websites, email links, or third-party app stores. Stick to Google Play Store on Android and App Store on iPhone. Before you install any app, check how many reviews it has and what the reviews say. An app with 50 reviews and mostly complaints is a risk.
Be cautious of apps that ask for unusual permissions. A calculator does not need access to your location or contacts. A flashlight does not need permission to send text messages. If an app asks for permissions that do not match what it does, do not install it. On Android, you can also check an app's permissions after installation: go to Settings, Apps, tap the app, then Permissions, and see what it can access.
Keep your phone's operating system updated. Go to Settings, About Phone (Android) or Settings, General, Software Update (iPhone) and install updates when they are available. These updates patch security holes that malware exploits.
What to do if you think someone else installed the malware
If you believe someone with physical access to your phone installed malicious software, or if you downloaded something from a link in a text message or email, take the same steps: restart in Safe Mode, remove suspicious apps, or factory reset if needed. After you reset, change your passwords for email, banking, and social media from a different device — a computer or someone else's phone. If the malware was stealing financial information, contact your bank.
If you share your phone with family members or gave someone your password, consider changing your Apple ID password (iPhone) or Google account password (Android). This prevents anyone with your old password from installing apps remotely.
Frequently Asked Questions
Can a virus on my phone spread to my computer?
A phone virus cannot directly infect a computer, but malware on your phone can steal passwords or banking information that you then use on your computer. If your phone was compromised, change your passwords on a clean device and monitor your bank accounts for unauthorized activity.
Will a factory reset delete my photos and files?
Yes. A factory reset erases everything on your phone. Before you reset, back up your photos and important files using Google Photos (Android) or iCloud (iPhone). These services save your data to the cloud so you can restore it after the reset.
Is it safe to read antivirus apps from the app store?
Most antivirus apps in the official stores are legitimate, but they cannot remove active viruses and many collect your data to show you ads. Google Play Protect (built into Android) and the security features in iOS are usually enough. If you want extra scanning, use Google Play Protect once and then uninstall any third-party antivirus app.
What if my phone is so slow I cannot navigate to Settings?
Try restarting your phone first — press and hold the power button and choose "Restart." If it is still slow, force restart: on Android, press and hold power and volume down together for 10 seconds; on iPhone, quickly press volume up, then volume down, then press and hold power until the Apple logo appears. Then try Safe Mode or factory reset.
Can I get a virus from visiting a website?
On modern iPhones, no — the browser and operating system are locked down. On Android, it is unlikely but possible if you read a file from a suspicious website and then install it. Avoid downloading files from websites you do not trust, and never install apps from links in emails or texts.