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AVG Mobile AntiVirus Security Pro
I'm not overly concerned with mobile viruses, but I'm also careful enough to like the idea of a little extra protection.
AVG Mobile AntiVirus Security Pro not only offers protection against malware, but also gives me the ability to remotely lock and find my Nexus 7 if I leave it in a bar somewhere. And if someone else decides to take it, I can make the errant tablet emit an ear shattering noise, even if muted, or even remotely wipe it if the worst comes to worst.
A bit geeky, and mostly unnecessary, but I like to know what wi-fi channels are the best around me so I can best configure my hardware.