I have a BT version of Gear s3 (Classic) and i connected it with my phone Samsung Galaxy J7 (2017).I can answer regular phone calls from my watch and speak from it! But can you answer and speak from your watch if the calls are from Fb Messenger and WhatsApp ? To me there is only a notification Missed call from Fb Messenger calls on my watch,and ,,Check your phone'' from WhatsApp. I use Messenger and WhatsApp calls more than regular phone calls so for me this is a problem ... any advice ? Sorry for my English 
