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2. AVG Antivirus
Price: Free; US$9.99 for pro version
Besides the usual scanning of apps, files and media in real-time and protection against phishing attacks, the AVG Antivirus app eliminates tasks that slow down one's device.
Users can also find their lost or stolen smartphones via the app which is integrated with Google Maps, or leave a message with a return address for people who find the phones.
For US$9.99, the AVG Antivirus Pro adds battery and storage optimization, secures apps from being accessed by others, and lets you back up all apps to the user's SD card.