Avast Free Mobile Security is probably the most comprehensive security app for Android with plenty of features for your safety.The Antivirus engine protects you against latest threats in both apps you install or update, but also while browsing the internet. The free version however, doesn’t detect adware. You can manually scan your device memory or SD card storage and even schedule scans when your device is idle.
Application Management lets you see how much space and memory are your apps using on your device.
You can selectively lock applications as you wish in order to be accessed only by you (using a PIN code). SMS and Call Filter will be very useful to avoid those spammers sending unsolicited messages or performing unwanted calls.
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Anti-Theft benefits from a central management console on the web and you can also use SMS to remotely lock, wipe or locate your lost device. You can also be alerted when the SIM card has been changed and you can activate a ringtone on your device.
There is a powerful firewall available only for rooted devices, a function that will limit or restrict applications’ access to the internet as you wish.
Last, but not the least, the Backup function is meant to make copies for your call logs, SMS archive, contacts, photos. Using the Premium version, you can backup music, movies and apps as well.
Premium version offers also the option to take a photo of the person who’s using your lost device, backup data from remote location and the option to lock an unlimited number of apps.