ExtremeTech: A smartphone contains huge amounts of personally identifiable information, and they also happen to be easy to lose. Android and iOS have different ways of going about device security, with Android devices taking a more DIY approach and iOS being more straightforward. There are well-known security practices like PIN and pattern locks, but both platforms let you go further. Whether you just want to keep nosy friends out, or your device contains sensitive business information, here’s what you need to know. (Android, iPhone, Phones)