How to hands free dial my Galaxy s7 Edge without having to wake up my Galaxy s7 Edge?

[AC Question]

Hi , how do you get the galaxy s7 edge to voice dial a number? I tried to use my Motorola Roadster 2, but I have to wake up my roadster via pressing the Galaxy s7 edge and then make me call from there. I used to just say "OK GOOGLE" call mom, and then it would call mom. Any help is welcomed. Gary Karno