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Within minutes of payment. A person creates it and sends the QR code — not an automated pipeline, which also means a human can fix it when an install fails. Then install it before you fly.

Airalo and Nomad sell true regional Asia plans that include Vietnam on one purchase. Holafly and BNESIM had no Asia regional package — with those you buy again in every country.

Holafly prices its Vietnam plan, its 7-country Southeast Asia plan and its 16-country Asia plan identically — so never buy their Vietnam-only one. And if Vietnam is your only stop, ours is $17 against their $73.90.

Count the countries on your trip. One means buy local — the gap is about four to one on a monthly plan. Three or more means buy a regional plan. Two is the only genuinely close call.

On the aircraft it is the airline; in the terminal, immigration holds it — not an airport desk. Storage is charged by time, so contact them in days rather than weeks.

No claim process exists once you walk away. The three options all happen at the tray: move it to checked baggage if allowed, hand it to someone in Vietnam, or lose it.

Only a multiple entry e-visa lets you come back on it, and only while it is still valid — validity counting from the issue date, not from your first entry. Unused days are not saved.

One to five years where one is imposed, and it becomes possible from a 30-day overstay. Discretionary rather than automatic — and it stacks on top of the fine rather than replacing it.

Green means nothing to declare, and choosing it is itself a declaration. The five thresholds that send you red — and why declaring cash costs you nothing.