We're traveling to Prague on to Salzburg and going on the Alpine Europe My Way tour ending in Switzerland. Any advice on what e sim will work in those countries?
Thanks.
Nearly every eSIM from an EU country will work for the EU countries (free roaming), e. g. T-Mobile CZ. Switzerland is not EU, can be very expensive. Avoid mobile usage there or reduce it to free wifi spots.
I have a EU Telecom (which is T-Mobile in Europe) sim with a German number, and I use the Verizon overseas monthly plan to retain my US phone number. Newer phones can have two sims. Both work in Switzerland. Roaming will cost extra, but I haven't been anywhere in Switzerland where I didn't have coverage. Admittedly I have pretty much been in the cities.