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5. NQ Mobile Security and Antivirus
Price: Free; US$19.99/year for premium version
NQ's privacy protection monitors apps that access your private data without permission, which is handy with the proliferation of rogue apps. Its traffic monitoring function also ensures you do not go over your data plan's limits, and lets you rank apps by data consumption.
The premium version comes with additional automatic virus database updates, online banking protection, and the ability to lock and wipe data if the phone is lost or stolen.