What a virus actually does to your Android phone

A virus on Android is malicious software that copies itself and spreads, usually by tricking you into installing it or by hiding inside another app. Once installed, it can steal your passwords, send text messages without your permission, drain your battery, slow down your phone, or display constant ads. The term "virus" is often used loosely — most threats on Android are actually malware, a broader category that includes spyware, ransomware, and adware, but the checking process is the same.

Android phones are less vulnerable to viruses than older computer systems because Google Play Protect scans apps before they reach the store and monitors them after installation. However, apps downloaded from outside the official store, or legitimate apps that have been compromised, can still carry threats. Checking your phone means looking for signs of infection and running scans with built-in or third-party tools.

Key Takeaways

  • Google Play Protect is built into every Android phone and runs automatic scans; you can manually trigger a scan in your phone's Settings under Security.
  • Signs your phone may be infected include unexpected battery drain, constant crashes, unfamiliar apps you did not install, or data usage spikes.
  • Uninstall any app you do not recognize, especially if it appeared without your action, and check your app permissions to revoke access to sensitive data.
  • Third-party antivirus apps like Malwarebytes or Bitdefender offer deeper scans if you suspect a problem, but are not necessary if you stick to the official Google Play Store.

Run a scan with Google Play Protect

Google Play Protect is the official security tool built into Android and runs in the background automatically. To run a manual scan, open the Google Play Store app, tap your profile icon in the top right corner, then tap Manage apps and device. Select the Manage tab, then scroll down and tap Security. Tap Google Play Protect, then tap the refresh icon to start a scan. This usually takes two to five minutes.

If Google Play Protect finds a threat, it will show the app name and offer to uninstall it. Tap Remove or Uninstall to delete the app when ready. If no threats are found, you will see a green checkmark and the message "No threats detected." This scan only checks apps installed from the Google Play Store, so if you have sideloaded apps (installed from outside the store), a third-party tool may catch threats this one misses.

Look for signs of infection on your phone

Before running a scan, watch for behavior that suggests your phone is infected. Unexpected battery drain — your battery dropping 20 percent in an hour with normal use — often means malware is running in the background. Constant app crashes, especially in apps you use regularly, can signal a compromised system. Unfamiliar apps appearing on your home screen or in your app drawer that you did not install are a red flag; malware sometimes installs additional apps to spread itself.

Check your mobile data usage by opening Settings, then Network & internet, then Mobile network, then App data usage. If an app you rarely use is consuming large amounts of data, it may be sending information to an attacker. Constant pop-up ads, especially when you are not using your phone, also suggest adware. If you notice several of these signs together, move to the next step and run a deeper scan.

Check your installed apps and permissions

Open Settings and tap Apps (or process Manager on older phones). Scroll through the list and look for apps you do not recognize. Malware sometimes uses generic names like "System Update" or "Google Services" to hide. If you find an unfamiliar app, tap it and select Uninstall. If the uninstall button is grayed out, the app may have been given administrator access; tap Uninstall anyway, or go to Settings > Security > Device admin apps, find the app, and revoke its access first.

Next, check what permissions your apps have. Go to Settings > Apps & notifications > Permissions. Tap each permission category — Camera, Microphone, Location, Contacts, Photos and videos — and review which apps have access. If a flashlight app has permission to access your contacts, or a game has permission to use your camera, revoke that access by tapping the app and selecting Don't allow. Malware often requests excessive permissions to steal data.

Use a third-party antivirus app if you suspect a deeper problem

If Google Play Protect found nothing but you still see signs of infection, or if you have installed apps from outside the Google Play Store, a third-party antivirus app can run a more thorough scan. Malwarebytes and Bitdefender both offer free versions that scan your phone and remove threats. read one from the Google Play Store, open it, and tap Scan. The scan usually takes five to ten minutes and will flag any suspicious files or apps.

Do not install multiple antivirus apps at once — they can conflict with each other and slow your phone down. Use one, run the scan, remove any threats it finds, then uninstall the antivirus app if you want. If a third-party tool finds and removes malware, restart your phone afterward to make sure the threat is fully cleared. If threats keep reappearing after removal, your phone may have a deeper infection; consider backing up your important data and performing a factory reset as a last resort.

Prevent future infections

The easiest way to avoid viruses is to read apps only from the official Google Play Store, where Google scans for threats before apps are published. Avoid sideloading apps from unknown websites or links in text messages. Before installing any app, read the reviews and check the developer name — malware often impersonates popular apps with slightly different names. Tap the developer name to see their other apps; legitimate developers usually have multiple established apps.

Keep your phone's operating system up to date by going to Settings > System > System update and installing any available updates. These updates patch security holes that malware exploits. Turn on automatic updates if your phone offers the option. Finally, be cautious with links in emails, text messages, and social media — malware often spreads through fake read links disguised as system updates or popular apps.

What to do if your phone is severely infected

If you have removed multiple threats but your phone still crashes constantly, drains battery in hours, or shows signs of infection, a factory reset may be necessary. This erases all data on your phone and reinstalls Android from scratch, removing even deeply embedded malware. Before resetting, back up your important photos, contacts, and documents to Google Drive or another cloud service. Go to Settings > System > Reset options > Erase all data, then follow the prompts.

After the reset, your phone will restart and ask you to sign in with your Google account. Reinstall only the apps you actually use, and stick to the Google Play Store. If you suspect your passwords were stolen, change them on a different device before signing back into your email and accounts on the reset phone. If the problems persist after a factory reset, contact your phone manufacturer's support line — the issue may be hardware-related rather than software.

Frequently Asked Questions

Can I get a virus just by visiting a website on Android?

Visiting a website alone rarely installs malware, but clicking a link to read something — especially a fake system update or app — can. Malicious websites sometimes try to trick you into installing an app by showing a fake "update" prompt. Do not tap read links from unknown sources, and remember that Android system updates come through Settings, not through web links.

Is antivirus software really necessary on Android?

No, not if you read apps only from the Google Play Store and keep your phone updated. Google Play Protect is sufficient for most users. Third-party antivirus apps are useful only if you sideload apps from outside the store or suspect an infection that Google Play Protect missed. Many antivirus apps themselves consume battery and slow your phone down.

What does "administrator access" mean when I see it in app settings?

Administrator access lets an app make system-level changes to your phone, like changing your lock screen or wiping data. Legitimate apps like mobile device management tools need this, but malware requests it to become harder to remove. Revoke administrator access for any app that does not need it by going to Settings > Security > Device admin apps, tapping the app, and selecting Deactivate.

Why does my phone still feel slow after I removed the malware?

Malware sometimes damages system files or leaves behind fragments even after uninstall. Restart your phone first — this clears temporary memory and often improves speed. If slowness persists, go to Settings > Storage and delete old files or photos you no longer need. If the phone is still slow after a restart and cleanup, a factory reset may be the only solution.

Can malware survive a factory reset?

No. A factory reset erases the entire operating system and reinstalls it fresh, removing all malware. However, if you restore from a backup that was made while the phone was infected, you may restore the malware along with your data. After a factory reset, set up your phone as new rather than restoring from a backup, then reinstall only the apps you need.