Yesim

Comparing plans across a dozen different eSIM brands before every trip is more research than most travelers want to do, and Yesim's Pay & Fly option is built as a shortcut around that: buy the eSIM once, and it works across more than 100 countries with a fixed per-gigabyte rate that applies no matter which of those countries you land in, so there's no separate country plan to select or compare beforehand.

Built by the Switzerland-founded Yesim, which runs a network of more than 800 partner carriers, Pay & Fly sits alongside the company's more conventional fixed-package plans for travelers who prefer to lock in a data size and price upfront. It's a reasonable middle ground between a full marketplace, where you actively compare providers, and a single-country plan, where you commit to one destination in advance: you're still paying only for what you use, but without the extra step of shopping between competing brands first. It suits a traveler with an uncertain or multi-country itinerary who wants simplicity over the lowest possible price.