When you hold your phone to your ear the call volume moves to the ear piece.
When you hold your phone away from your face the call volume moves to your speaker, if you are connected to a Bluetooth device, the call volume will play through your car audio, speaker or headset.
If you are connected to a Bluetooth smart watch and receive a call, the audio will route back and forth from the smart watch to the ear piece . this has been tested with Samsung gear s2 and s3
Working on supporting auto speakerphone for more call apps. Please let me know what apps work and which ones do not.
Next update will support Facebook messenger calls