[NolF]

Android Lollipop has the option to pin the user to the app [1]

[1] http://www.cnet.com/au/how-to/ho-to-pin-apps-in-android-5-lo...

[seanp2k2]

Moot points: http://arstechnica.com/tech-policy/2011/04/michigan-state-po... and this was in 2011...

[cleverjake]

There is also Guided Access mode in iOS