sjordi Well, What a disappointment, I have an extra - eSim for my Apple Watch and now that watchOS 9.1 is released, I called Sunrise just to be told they will not support it. So that means goodbye Sunrise, hello Swisscom (which I hate). Too bad.
pato Actually at this time it works with no Swiss provider, here you find it (in German) for Swisscom that it’s not working for Apple Watches: https://www.swisscom.ch/de/privatkunden/hilfe/mobile/multi-device.html Multi Device funktioniert auch im Ausland: Ihre Roaming-Inklusiveinheiten gelten dabei für Haupt- und Zusatzgerät(e) (mit Ausnahme der Apple Watches).
sjordi I think that this page is not up to date. Roaming is available now with watchOS9.1 After a call, they told me it was implemented. Swisscom was also shown as one of the supporting operators during the Apple Event