I have always installed anti-virus apps on my smartphones just for an added layer of security. I'm not sure if there is a lot of malicious materials out there that are designed to infect or damage an android phone but I always figured it was better to be safe than sorry. I've tried a few anti-virus apps, but the most useful I've found called Netquin. They have several related apps to optimize your RAM as well as call/text message blocking features, and an extension that allows you to hide private photos, phone numbers, messages and call logs that some may find handy. I think that most of its features are available through the native android OS or by way of your service provider, but it does centralize things and make them easier to set up and maintain, which is nice. I personally haven't downloaded any play store apps that were malicious but it does scan every app you download to your device for safety. I have ran into situations where it has warned me about a malicious text message as well as a few potentially malicious websites and e-mail links I've clicked on by mistake. I consider myself a reasonably educated user, so I avoid most actions that I think my be either harmful to my device, or potentially comprise my personal information. However, I don't think anyone can avoid EVERY potential threat, so for that reason as well as for less adept smartphone users, these types of apps can be invaluable. The only downside I've found to Netquin is that it does have some advanced or "Premium" features as Netquin puts it, that are subscription based. Small quibble, as the free features are quite extensive, but a quibble nonetheless. Unfortunately, since I purchased the HTC One and re-downloaded the app, it no longer allows me to use any of the free features. I'm waiting to receive a response from an e-mail to Netquin customer support abiut this and will update this post to reflect any new information if it is helpful to any other forum members. Sorry about the super long post but, hopefully this can help give other forum participants insight and information that could potentially guide them to a more educated decision on smartphone security. Thank you to everyone for all the help I so frequently seek on these types of outlets. Hopefully this post can serve as my attempt at reciprocation.