I have been trying to find a way to use voice commands from lock screen. Obviously s voice doesn't work. Google is rolling out an update to allow ok Google from any screen. I found a link to download it and will post at the end. Unfortunately the lock screen timeout makes it almost useless because it doesn't actually unlock it and it times out. I found a way around that until they fix it. Wake up phone (apparently only time that isn't necessary is on charger) I use the air wake. Say ok Google, then immediately tell it to open s voice. The screen just starts to turn off as s voice opens. Now tell s voice to open Google. [APK Download] Google Search v3.5.14 Brings 'OK Google' Hotword Detection To Any Screen, Even The Lockscreen And Display Turned Off