When you pair your watch with your phone for the first time, the phone may ask if you want to set your watch as a trusted device. If you agree, your phone will remain unlocked when the watch is within range and connected to the phone.*
*Note: You need to set a screen lock on your phone and set your watch as a trusted device. Corporate security policies installed on your phone may prevent you from using this feature.

Tip: To manually set your watch as a trusted device, on your phone tap Apps > Settings > Security > Smart Lock > Trusted devices.