Hi I just bought the Galaxy Frontier watch. Built great. My biggest gripe is Tizen. Horrible selection and much more limited in scope for apps then Wear OS. If Samsung decided to allow Wear OS apps to be installed and functional I seriously believe it would do better in sales then the Apple Watch.
You should open the wearable app and select your gear s3 Frontier and check for updates the watch should have a update to One UI
Open Galaxy Wearable app select your watch then t the bottom select about watch then check for update
Still very poor selection of apps let alone a outdated s voice that sounds creepy. For $300.00 you think they would do better. I'm currently researching ways to flash and install Wear OS on my watch