I have an iphone for work and constantly send emails on the go. Some of the information I send is confidential and in fairness I try and cover my screen as best I can whilst still seeing what I am typing! This can be difficult if I am on publis transport trying to keep up with my work etc. At work I have a screen which I stuck over my PC screen which is dark and means you can see throught it only when you are standing right in front of it. From all other angles you can't see through it, which is ideal as people walking past down the corridor cannot see the information. I casually mentioned to someone at work it would be handy to have one of these for my iphone and then ..  Read the complete review