I use the AVG free from the Play store. Seems to be OK on mine. Easy to do a manual scan. Doesn't affect speed.
Also has a list of actions and codes for dealing with your N7 if lost.
Must remember to write them down!
What is ransomware and how do I protect my PC from WannaCry?
What I learned from my mentor, Oscar-winning VFX supervisor Phil Tippett
Siri vs Google Assistant
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