The local operator whose towers a travel eSIM uses in each country.
A travel eSIM brand usually does not run towers of its own. It signs agreements with local mobile operators, and your eSIM attaches to one of them in each country.
That is why two plans with the same headline country count can give different speeds and signal in a given city.
What to check
- Check the partner list if the plan page names networks
- Coverage can differ between a city and the countryside