For groups of travellers staring at one printed bill and five people who all want to pay their share — in the right order, with the real numbers attached.

Divers and snorkellers booking out of Nha Trang, in the right order: what to settle at the shop counter in town, and what the boat crew will only take in cash or QR.

For visitors and expats using Grab in Vietnam who want to know why the app keeps bouncing them back to cash, and what to do at the kerb when it happens.

For foreigners who have handed a passport and several hundred dollars to a visa agency in Hanoi, Da Nang or Ho Chi Minh City and want to know what happens if it goes sideways.

For remote workers booking a desk in Da Nang, Hanoi or Ho Chi Minh City who want to know how the money actually leaves their pocket each month.

For travellers who want to tip properly in Vietnam without hoarding dong or hunting ATMs — and who are heading out of the cities at some point.

Bank cards get declined, transfer apps can't pay market stalls, and local e-wallets take weeks to set up. Here's how the real options stack up for foreigners in Vietnam.

Begin with the one that costs nothing. LocalPay gives you 5GB in Vietnam plus a QR wallet spanning Vietnam, Indonesia and the Philippines — add a paid regional plan afterwards, and only for the legs it leaves open.

Navigation costs almost nothing. What quietly empties an allowance is the stuff travellers never think to account for — autoplaying video, an evening call home, a laptop on your hotspot.

Either one gets you online. What actually separates them is what you pay, whether you need a Vietnamese number, and which network you're riding on once the cities are behind you.

Whether you'd rather grab a SIM the moment you land or activate an eSIM before you even board, here's how to get online in Vietnam without overpaying or wasting time at arrivals.

Two people built Rounds because they lived through the dread of medical documents they couldn't understand. This is what it does, and why it matters.