Can Facer support tell us where they are if anywhere on the update to the Facer iOS app to support the Samsung S3 (or other non Apple Watch watches) ? If not is there another way to be able to push purchased/free watch faces from Facer (perhaps web interface) onto an S3 paired with an iPhone? This is something that so many are looking for and yet no response from Facer. Watchmaker already supports this, why not Facer?
If I understand you correctly, you want to use the Gear S3 paired to the iPhone?
Absolutely, you need to download the Gear S app and the Facer app onto your iPhone. You can then get the watch faces from Facer on to your Gear S3 or any other non-apple watches.
Hope that helps you.
Allen van Jaarsveld