mobile app buttons need more contrast when pushed

When you push mute or speakerphone (iPhone OOMA mobile app), it is very difficult to see whether it is pushed or not, which
can lead you to be talking while on mute, or talking while NOT on mute, either one which can be embarrassing or disruptive.

A suggestion would be to make the contrasting color or share more distinct vs on or off. This is particularly an issue in bright light.