How to turn on S Voice through headphones with screen locked?

[junbug119]

This is my first Android phone, I am a total noob. I've searched all over the Internet and this forum and can't seem to find an answer. What I've been trying to figure out is how can I have S Voice turn on our wake up using the call button on my headphones while the screen is locked (similar to siri and iPhone). I do have wake up while locked on and voice wake up on. Am I missing something?

 

[Brizod]

Hi

Did you find a fix for this issue? I'm in the same boat.

Cheers