The search for applications to eliminate viruses On mobile phones, the idea is inherited from computers: that there is a program infecting the device and an antivirus capable of removing it. On Android, the reality is different in two important ways. First, the system already has built-in protection that automatically scans applications. Second, most infections don't come from "viruses," but from installing files obtained outside the official store and from permissions granted to the wrong application.
This guide explains what Play Protect does on its own, where it doesn't reach, when a third-party antivirus adds value, and what to do if you suspect your phone has been compromised.
What Google Play Protect already does
Play Protect comes active on virtually every device with Google services. It scans apps before installation, periodically checks those already on the phone, and alerts you when it detects suspicious behavior, including in programs installed outside the app store. It also detects apps that hide themselves after installation, a common pattern in malicious programs.
To check if it's connected, open the Play Store, tap on your profile picture, and go to... Play Protect. There you can run a manual check and see when the last scan was done. It's free, already installed, and doesn't ask for any additional permissions.
Where do the problems really come in?
- Installation files downloaded outside of the store. It's the main route. "Modified" versions of popular apps, programs that promise paid features for free, and files received via chat are the quickest way to get into trouble.
- Accessibility permission granted to suspicious application. This feature, created for screen readers, allows you to read everything that appears on the screen and simulate touches. It's the mechanism used by banking scams on Android. If any app requests accessibility, refuse it.
- Social engineering scams. Message with a link, fake tech support asking you to install a remote access app, promotion requiring registration. There's no malicious program here: someone is trying to convince you to open the door.
- Legitimate apps with abusive advertising. They are not viruses, but they interfere with usage and consume resources. The store removes these programs when it identifies this behavior.
When a third-party antivirus helps.
This makes sense for those who install apps outside the store, for those who use their cell phone in a corporate environment with security requirements, and for those who want additional features such as blocking malicious links, password leak alerts, and lost device location. Well-known options available in the store include... Avast One, AVG Antivirus, Bitdefender Mobile Security, Norton 360 It is Sophos Intercept X for Mobile.
Two honest caveats. None of these apps remove malicious programs that have already gained elevated privileges on the device—in those cases, the only option is a factory reset. And several of them sell subscriptions with features you may already have: dangerous website blocking is available in the browser, and device location tracking is done through the system's own service.
What to do when faced with a suspicion
Signs that deserve attention: ads appearing outside of apps, data or battery consumption far above normal, apps you didn't install, device overheating while idle, and changes you didn't make.
The script is this. First, enter... Settings > Accessibility and turn off any service you don't recognize. Then, review Settings > Applications Look for unusual names, and also check the apps with administrator privileges on your device. Restart in safe mode, which loads the device only with factory-installed apps—if the problem disappears, it comes from something you installed. Run the Play Protect scan and, if nothing resolves the issue, back up your files and restore the device to factory settings. Finally, change the passwords for important accounts from another device.
How Android is built to contain malicious applications
The reason why cell phones don't get viruses like computers does lies in the system's architecture, and it's worth understanding because it defines where the real risk resides.
- Isolation between applications. Each app runs with its own identity and only accesses its own area. An application cannot read another app's files, nor can it modify the system.
- Permissions that you grant based on usage time. Camera, microphone, location, and contact information are requested immediately and can be revoked later.
- Digital signature. An update is only accepted if it comes signed with the same key as the original developer — this prevents someone from replacing a legitimate app with a modified version.
- Read-only system partition, This ensures that a factory reset returns the device to a clean state.
That's why a cell phone attack is almost never an "infection": it's... convincing. Someone needs to get you to install something, or grant you a powerful permission. Everything else follows from that.
The two permissions that are worth more than any antivirus.
If you only look at two things on the device, look at these:
- Accessibility. It was created for screen readers and automation, and it offers something huge: read the displayed content and simulate touches. This is the permission used for mobile banking fraud—the program sees what you type and operates the app for you. Without a recognized screen reader, this request is grounds for declining and uninstalling.
- Install unknown applications. Granted to a browser or messaging app, it opens the door for installing files downloaded from anywhere. It should be disabled by default.
In third place comes device administrator, This makes uninstallation difficult—and it's like an unwanted program clinging to the device.
Signs of a problem, and what each one usually means.
- Full-screen ad outside of any app. — almost always a recently installed app with adware. Uninstall the most recent one first.
- Application that you did not install appearing on the list.
- High and unexplained data consumption, visible on the app data usage screen.
- Battery draining quickly when the device is idle.
- Appliance gets hot without heavy use.
- Browser redirection For fake warning pages like "your phone is infected"—which are advertisements, not diagnoses.
Correct order of response: safe mode to confirm that the problem originates from an installed app, Review accessibility and device administrator., Uninstall recent apps and if nothing else works, factory backup and restore — which is the only way to truly reset the device.
How to check Play Protect and what to do with the result.
It comes on and runs in the background, but a manual check reveals information that nobody usually looks at: When was the last analysis performed, how many apps were checked, and were any flagged as harmful?. The path is through the app store's own menu, in the Play Protect section.
Two settings are worth checking out there:
- Improve the detection of malicious applications. — It sends unknown packets installed outside the store for analysis. It is disabled on some devices, and this protection is precisely what matters to those who have already installed something from outside the store.
- Verification of applications installed from other sources., which needs to be active.
If something is flagged, removal is suggested immediately. And there's a useful detail: apps removed en masse from the store due to abusive practices often remain installed on devices—removal from the store doesn't uninstall it from your phone. It's worth checking from time to time if any apps you use have disappeared from the store, because this usually happens for a reason.
Frequently Asked Questions
Can a cell phone get viruses like a computer?
Not in the same way. On Android, each application runs in isolation from the others, so there isn't a program that "infects" the others as happened on computers. What exists are malicious applications, installed by the user themselves, that abuse the permissions granted to them.
Does an iPhone need antivirus software?
There is no real antivirus for iPhone. The system doesn't allow an application to scan the files or processes of another, so a scan in the traditional sense is technically impossible. What is sold in the Apple store under that name is usually a VPN, ad blocker, or password manager.
Is it okay to use two antivirus programs at the same time?
No. They compete for the same resources, generate duplicate alerts, and consume battery without providing relevant additional protection. Choose one, if you decide to use one, and keep Play Protect enabled alongside it.
Do ads appearing on the home screen mean there's an infection?
This means that some installed application is displaying advertising outside of the permitted context. It's not always a malicious program—it could be a common app behaving abusively. Identify the culprit by checking your recent installation history or by using safe mode and uninstall it.
Does antivirus software slow down your phone?
You can leave it as is, because it runs continuously in the background and performs periodic scans. On devices with limited memory, the impact is noticeable. It's worth weighing this cost against the actual benefit in your specific use case.
Conclusion
Keeping Play Protect active, installing only from the official store, updating the system, and never granting access to unknown applications cover the vast majority of real risks. A third-party antivirus is a useful extra layer in specific situations, not a basic requirement—and neither replaces the care taken with what you install and the permissions you grant.
Read too
- Antivirus on your phone: where do infections come from on Android and iPhone?
- Clearing your phone's memory: what Android already does automatically.
- Fixing cell phone errors: five problems you can solve yourself
- Clearing memory and speeding up your phone: what really works and what's a myth?
- More battery on your cell phone: how to find out what's draining your power.
