How do i activate/use a wake up command on my s5

[AC Question]

I just got a galaxy s5. My old phone was an s3 which allowed me to say a commanx while it was in sleep mode, so to speak. When the command was given it would come out of sleep, unlock itself and open my music ayer and begin ayng music where it left off last time of use.

 

[B. Diddy]

Welcome to Android Central! S Voice or Ok Google?