iOS10: automatically switch to speaker when in call?

Hello,
In iOS10 I found a new toggle under voiceover under audio called automatically switch to speaker when in call. I wonder when this feature is turned off if this will allow you to switch to speaker manually? I know some of you were wanting that feature so that's why I'm posting about it.

Forum: 

When this is turned off,

When this is turned off, phone calls don't switch to speaker automatically when you move the phone away from your ear. I never really liked automatic mode anyway

It works even when facetiming someone

It works even when one makes FaceTime calls and I was quite surprised at first. But there is one problem to select options or dial extention numbers I can't do that when this is turned off. Any ideas?