Switzerland

QWhich Swiss carrier is best for the Alps and trains?

ASwisscom is widely regarded as the gold standard, with the most extensive national network and strong signal on trains, in tunnels, and on alpine routes — but it is not sold to travel eSIM brands, so an eSIM means Sunrise or Salt. Sunrise is the stronger of the two outside cities. For mountains and rail, choose a Sunrise-backed eSIM.

QHow much data do I need for a week in Switzerland?

AA standard week of maps, the SBB train app, and social fits 5–10 GB. A 10 GB Sunrise-backed plan runs a few dollars; size up to 15–25 GB for two weeks or heavy uploads.

QWill I have signal at high altitude?

ACoverage is excellent across cities, Lake Geneva, Interlaken, Lucerne, and major ski resorts on Sunrise. Very high alpine terrain — remote glaciers and off-piste above ~2,500 m — may have limited or no signal regardless of carrier.