Use roaming only long enough to get a safe route. Switch to airport Wi-Fi, official taxi, airport rail, or a travel eSIM/local SIM rather than trying to force slow data to handle everything.
Do not try to debug roaming while walking with luggage.
Do not rely on live maps without saved hotel details.
Traveler experience
Watch and read real traveler context
These videos and Reddit threads are related to this guide's scenario. Use them
as practical context, not as a guarantee that the same steps will work for every
card, device, passport, hotel, route, or merchant.