TL;DR: Hanoi, Ho Chi Minh City, and Ha Long Bay - Vietnam travel essentials and mobile data for 2026.
When to go
North cool Nov-Mar; south dry Dec-Apr.
Cash and cards
ATMs widespread; data helps find reliable exchanges.
eSIM
Vietnam plans - avoid airport markups.
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Frequently Asked Questions
North to south route?
3 weeks allows Hanoi, central coast, and HCMC.
Grab in Vietnam?
Works well in cities with mobile data.