avast! Free Mobile Security

Protects you from malicious attacks and helps you locate your lost or stolen device.
avast! gives you mobile antivirus protection and mobile tracking while concealing itself from would-be thieves.
Avast for Android is the top-rated (4.6 stars) free mobile security app with both antivirus and anti-theft.

Antivirus protection for your Android
avast! Mobile Security keeps you safe from malware and malicious apps.

Filter incoming calls and SMS messages
Block specific numbers from being able to call or send SMS messages.

Official site: avast.com
Google.Play: Mobile Security & Antivirus

Track your lost or stolen device
Our Anti-Theft component provides you with remote options for locating and recovering your phone.

Monitor your security status
The homescreen widget gives you easy access and instant protection status.

Warns you of infected websites
Web Shield warns you if your browser tries to load any malware-infected URLs.

Add a firewall to block hackers
If your phone is rooted, you can add a firewall to ensure that hackers stay out of your phone.

Track network data and Wi-Fi usage
Your data usage is tracked to help you stay closer to your monthly data limits.

Auto-correct for mistyped URLs
If enabled, SiteCorrect helps prevent the troubles of mistyped URLs.

Avast premium pack which includes more security features!

Set a perimeter with Geofencing
Phone performs specified actions (e.g. lock, siren, send location) when it leaves a set perimeter.

App Lock to control access to apps
Lock an unlimited number off apps in order to prevent their unauthorized access.

Increase device access security
Locks access and takes a picture of the person attempting to unlock your device after three tries.

Detect which apps use ads
Detects ads and provides full details of their tracking systems.

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