Please could you guys advise me? I am starting to use my nexus to buy things with my credit card. Only apps so far but using the Nexus more and more for browsing and can see that I'm going to want to do this more often in future. On my PC I've got McAffee and all sorts of passwords. I would hope I'm secure on that. What about security on my Nexus? What do I need to make myself secure?