I can’t use the “OK Google” voice recognition on my Android phone

Some phone manufacturers add a default speech recognition application and so often this application is used by default by your phone.
At first try to use OK Google without the kit to verify that it works well (you have to look for the application that is called Google (icon with a G in several colors).
Then check that when you press the Voice recognition button of your phone (often a long press on the center circle at the bottom), this launches OK Google.
If you now connect the S61 kit to the phone and press the voice recognition button on the kit, it should launch OK Google on your phone, all you have to do is to say “call xxx”