Officially, only Swisscom supports the Google Pixel Watch 4 (source:
https://support.google.com/googlepixe...). However, other users report that there is a way to use the watch with other plans. Apparently, you have to get to a certain screen with a SIM from a recognised supplier (in our case Swisscom) and can then scan the eSIM code of the actual plan.
These are the instructions:
https://www.reddit.com/r... - in our case, replace step 1 with "Insert a SIM card from Swisscom." Better prepaid, as it's cheaper - or a SIM from a friend.
So far, this has only been confirmed with older Pixel Watch models and not with Galaxus Mobile. That's why I'm here. Personally, I don't yet know whether I'll give the whole thing a try.