It would appear that there's not a dedicated app for it at the moment, only message notifications. I think WhatsApp will have to amend their app. However this is a reply I got from Samsung help  Hi, Thanks for your message. WhatsApp Calling allows you make calls through WhatsApp via your phone’s Internet connection rather than your cellular plan’s voice minutes. (Note: data charges may apply). You can place a call in WhatsApp to any contact that isstored in your phone's address bookwho also has WhatsApp Calling. Below you can find the operating system requirements for the WhatsApp Voice Calling and Video Calling: Voice Calling: AndroidiPhone (iOS 7 and later)Windows Phone (OS 8 and later) Video Calling: Android (OS 4.1+)iPhone (iOS 8.0+)Windows Phone (8.1+) In order for these features to be available please make sure that you are using the latest available version for your device by going here. Note: You can’t access 911 and other emergency service numbers through WhatsApp. You must make alternative communication arrangements to make emergency calls. Learn more about using WhatsApp Calling on: Android, iPhone or Windows Phone. This question, as you can see hasn't been answered so I've sent them another follow up to get some clarification. ... View more

It would appear that there's not a dedicated app for it at the moment, only message notifications. I think WhatsApp will have to amend their app. However this is a reply I got from Samsung help  Hi, Thanks for your message. WhatsApp Calling allows you make calls through WhatsApp via your phone’s Internet connection rather than your cellular plan’s voice minutes. (Note: data charges may apply). You can place a call in WhatsApp to any contact that isstored in your phone's address bookwho also has WhatsApp Calling. Below you can find the operating system requirements for the WhatsApp Voice Calling and Video Calling: Voice Calling: AndroidiPhone (iOS 7 and later)Windows Phone (OS 8 and later) Video Calling: Android (OS 4.1+)iPhone (iOS 8.0+)Windows Phone (8.1+) In order for these features to be available please make sure that you are using the latest available version for your device by going here. Note: You can’t access 911 and other emergency service numbers through WhatsApp. You must make alternative communication arrangements to make emergency calls. Learn more about using WhatsApp Calling on: Android, iPhone or Windows Phone.   This question, as you can see hasn't been answered so I've sent them another follow up to get some clarification.   ... View more

@DF8 wrote: I don't use the watch for calls either but I do like to see who is calling (receiving the caller ID on the watch). This should be able to include WhatsApp caller ID as well. Any solutions? Not at the moment. I think it might have something to do with the calls being  seen as end to end encryption via wifi and it might be seen as a security risk. If I hear of a fix I'll let you know. ... View more

I wouldn't use it for answering calls etc. Only use WhatsApp for text messages. Pretty awful quality for voice calls. ... View more

I'm sorry, but I only use it for text messages. Prefer calls via normal calls. ... View more

I have the Note 9 and get all notifications. It might be handset specific.  ... View more