In Vietnam: a local physical SIM is the better choice — passport/ID registration is required to buy a local SIM.
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A local physical SIM is the better choice for Vietnam. Vietnam requires passport registration for physical SIMs, though it's quick and easy at the airport; eSIM coverage is decent in cities but less reliable in rural areas.
Yes — Vietnam requires passport or ID registration to activate a local physical SIM.
Buy your physical SIM at the airport arrivals hall in Vietnam — most major carriers have a kiosk right past immigration, and staff can handle the registration paperwork for you.
Only if you're fine paying your home carrier's international roaming rates — check your plan first, since those can add up fast compared to a local SIM or eSIM.
Airport SIM booths and roaming plans are the expensive way to get online. A Saily eSIM (by the team behind NordVPN) installs on your phone before you fly, activates automatically when you land in Vietnam, and gives you prepaid data at local prices in 190+ countries — no physical SIM, no contract, no surprise bill.
See Saily data plans for Vietnam →Disclosure: if you buy through this link, TravelSmarter may earn a commission at no extra cost to you. It keeps our tools free.