Before Wear OS 3 for the Samsung Galaxy Watch 4 series was officially announced, it was rumored that the company was working on a walkie-talkie feature. Now, Samsung’s WalkieTalkie app has been released on the Google Play Store, and it allows two users to have a conversation with just their watch. Only Samsung Galaxy Watch 4 owners can use it to talk to one another, and you can’t use previous watches from the company either.
So it is pretty limited right now, as is Apples, except maybe there are a lot more Apple Watches in circulation. I was sort of surprised on my Apple Watch to see no Zello app (phone only). Zello could have been the cross-platform killer Walkie Talkie app. We don't need more limited fragmentation.
See Turn your Galaxy Watch 4 into a Walkie Talkie with Samsung's new app
You can turn your Samsung Galaxy Watch 4 into a walkie-talkie with Samsung's latest app, though it only works with Galaxy Watch 4 owners.