One eSIM for every stop on the route

Usually from the third border onwards. Two neighbouring countries are often cheaper as two single-country plans; a three- or four-stop route almost always favours one regional plan, and you only install one profile.

The picker says so rather than guessing. Buy one plan for the longest stay and a second for the rest — both sit on the phone at once, and you switch the active line in settings.

Yes. A regional or global plan keeps one profile and one pool of data across every country on its list, so crossing a border changes nothing except the network you are connected to.

On your first connection at a destination, not at checkout. That is why buying before you fly costs you nothing — install at home on Wi-Fi and leave the line switched off until you land.