The Smart Unlock is undoubtedly one of the most important features of the new version Android 5.0 Lolipop. This is a service by which we can automatically unlock our Smartphone by connecting a Bluetooth device or by connecting our Smartphone to a Wifi network.
As well as the devices that have officially picked up the new version Android there are few, the application has been released Smart Unlock which can be downloaded for free and compatible with devices running Android 4.0 +.
In the download link given below you will find the application in XDA-Developers because the Google Store is testing for 7 (only) days.
An application that automatically unlocks our device as soon as it connects to a "protected" place that we will declare. That is to say a Wifi network, and when our device is connected to it, it automatically unlocks, and when disconnected from the network, it locks. The same is true when setting up a trusted Bluetooth device, such as our headset.
Note: The application does not require root privileges, and you can register up to 3 trusted devices.