Most flagships since 2018. Almost everything that costs over $400 and was made in the last six years. Below is the precise list of devices travel.to is tested against.
Phones bought through carrier financing are often network-locked. The eSIM hardware works fine, but the carrier may reject foreign profiles until your phone is unlocked. Most carriers unlock automatically after 60–90 days of paid bills.
Sold in the US, these have no SIM tray — eSIM is the only option. That's a plus for travel.to: you scan the QR and your phone is fully online with no physical SIM to manage.
No eSIM support. iPhone X and earlier, original Pixel and Pixel 2, Galaxy S9 and earlier — these phones need a physical SIM. travel.to doesn't ship physical SIMs.
Open Settings → General → About → "Available SIM" or "EID". If you see an EID number, you have eSIM. iPhone shortcut: dial *#06# — if EID shows alongside IMEI, you're good.