Although it is only available on Lollipop, I find it pretty neat that these features have native support. The caveat about setting a trusted place to unlock is

Although it is only available on Lollipop, I find it pretty neat that these features have native support. The caveat about setting a trusted place to unlock is straight out of Tomorrow Never Dies[0]: "Be aware that location signals can be replicated or manipulated — someone with access to specialised equipment could unlock your device." [0]: http://en.wikipedia.org/wiki/Tomorrow_Never_Dies http://en.wikipedia.org/wiki/Tomorrow_Never_Dies