Use the original passport, confirm the plan includes what you need, and finish the setup before leaving the counter. If the line is long or the counter is closed, use roaming, eSIM, or hotel Wi-Fi until later.
You want a local SIM at the airport or service counter, and staff ask for passport registration. You need data or a local number without losing arrival time.
Do not assume a local SIM avoids every internet restriction.
Do not assume a data SIM provides SMS.
Do not throw away the home SIM if it receives bank codes.
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.