Android is by far the most popular and biggest mobile operating system, being installed on the majority of devices out there and often that malware is hidden inside bogus apps. Our smartphones are now crucial parts of our daily lives. Managing our bank accounts, communicating with our loved ones and organizing business tasks are all done through our mobile devices. 

 The AVL

AVL is already a winner of the AV-Test (a well-respected independent antivirus testing outfit) award for best protection of mobile devices. The features which include not only an antivirus database but a scanner capable of detecting any kind of malicious file making its way onto your device.

Other accessible features include a call blocker to prevent malicious numbers from contacting you. Also, an anti-phishing feature to stop harmful sites from loading in the first place is included. The app is also designed to be light and handy on resources, which is always at hand when you're struggling for battery life.

The Avast Antivirus & Security

Antivirus giant Avast has used its considerable skills to make an app which goes above and beyond a day-to-day scanner. Extra features in the free version including a call blocker, firewall and even an anti-theft measure allowing you to remotely lock or wipe your Android device if it gets lost. The app used to be paid but is now free, is supported by ads. You can pay a small monthly or yearly premium to remove these. Another very useful premium feature is the "in-app locking" wherein your device will ask for a PIN before opening certain apps. This restricts malware from launching apps such as internet banking automatically.

McAfee Security & Power Booster Free

McAfee is another well-known name when it comes to antivirus software for the PC, and this Android app is quite impressive. Besides the antivirus scanner itself, free features include tracking a lost device as well as locking and wiping it remotely. If your device is stolen or missing, the app can even take a picture of the thief. Other features include the ability to scan apps to check if they leak sensitive information, and lock them if necessary. McAfee will also restrict access to potentially malicious websites, as well as allow you to keep a blacklist of annoying callers and texters.