I had done this for my airtel esim only. For other carriers I think it automatically works.i tried for airtel only as I don't have other carriers sims

I think the airtel and samsung people are dumb. They might be knowing this but not publicizing it for unknown reasons. This i believe is a problem for other watches also. Not sure how to promote this. Reddit can be an option

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For all of your watch supports esim, then activate the airtel esim. For some watches the problem of no service can be manually rectified. First dial *#2263# from your watch dialler. Then select LTE, then again select a band for e.g. select "LTE ALL" ...