One eSIM for the whole trip. It works in every country he visits, no new SIM at each border.
Open Settings, tap Cellular, then Cellular Data.
Tick Roamless instead of
Canada. Turn Allow Cellular Data Switching off.
Back in Cellular, under SIMs: tap Roamless, set Data Roaming on. Tap
Canada, set Data Roaming off.
Settings, Cellular, Cellular Data: tick Canada.
Optional: under SIMs, tap Roamless and turn the line off. Leftover credit stays in the app for the next trip.
Checked Oct 7 2026 against Roamless's own iPhone setup guide. Check the credit any time in the Roamless app.