How to get face unlock for all android mobile

How to get face unlock for all mobiles ,android mobiles .it's easy way
Step 1: Chech your android os version or update your version must be need  5.0 lollipop
Step 2: settings <security<smart lock <trusted face next set up your face for face unlock ,it's is easy method .

Step 3 : watch this video

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          Please watch  video