GigSky

GigSky predates the current wave of eSIM apps by close to a decade, having built its business on prepaid data roaming before eSIM hardware was common, and it still runs plans for cruise lines and airlines alongside its consumer app. Coverage stretches past 200 countries, with per-country plans starting around $3 for a small bundle and a single "World" eSIM that covers 172 destinations for travelers who don't want to juggle country-specific profiles on a multi-stop trip.

Per-gigabyte cost drops sharply at scale: a 100GB, 180-day plan in a country like Austria works out to roughly $0.55 per gigabyte, cheap enough that GigSky is worth checking even outside its usual strength in North America and Europe. GigSky One, its subscription option, bundles 50 to 100GB a month billed monthly, quarterly, or annually, which suits someone who travels for work every few weeks rather than the once-a-year vacationer. Plans are data-only. There's no flat unlimited tier, so it's a better fit for people willing to buy the right-sized bundle than for someone who wants to stop thinking about data entirely.