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Install before you fly
Install on Wi-Fi at home, and do not assume when the validity clock starts.
Use Wi-Fi
Installation needs a data connection. Do it on Wi-Fi before you travel, while you can still reach this account and the phone settings.
Keep the phone unlocked and the carrier lock removed first. Those are separate from installation.
The clock is plan-specific
Some plans start when the eSIM is installed. Others start at the first connection to a visited network. eSIM Access sends this as an activation code on the package, and RoamFinch does not guess which event starts a plan when that code is missing.
The supplier also sends an unused-validity window. If that window is short, do not install weeks before the trip until the live package states the rule.
Altre guide
Staying online in FranceParis, Lyon, Marseille, and Nice search for France. A city does not get its own plan. The package has to list FR.Staying online in GermanyBerlin, Munich, Frankfurt, Hamburg, and Cologne search for Germany. A city name is not coverage. The package must list DE.Staying online in ItalyRome, Milan, Venice, Florence, and Naples search for Italy. They are not separate eSIMs. The package must list IT.