You can't use the watch very much because many things don't work. But that has nothing to do with Switzerland, but with bugs. Find my phone, deactivating heart rate measurement, deactivating activity notifications, deactivating menus, all this hardly ever works. The sensor to switch on the display sometimes works, but unreliably and with a delay.

I don't see why it shouldn't work in Switzerland because of that.

The watch and also the app, called Zepp, work without any problems in Switzerland.