The numbers
| Vietnam | |
|---|---|
| Voltage | 220 V, listed as 220/380 V |
| Frequency | 50 Hz |
| Socket types | C and F |
| Type C | Europlug, two round pins, ungrounded |
| Type F | Schuko, two round pins with earth clips |
Disclosure: VietSIM sells prepaid eSIMs for Vietnam. We do not sell adapters, and a plug page that tries to is not worth reading.
Adapter, not converter
This is the distinction that saves people money and worry. An adapter changes the shape of the pins. A converter changes the voltage. Vietnam’s 220 V is the same range as most of Europe, Asia and Africa, and different from North America’s 120 V.
Turn your charger over. If the small print says 100 to 240 V, 50 to 60 Hz, then the charger already does the conversion internally and all you need is the right shape. That covers essentially every modern phone, laptop, tablet and camera charger.
If something says 120 V only, leave it at home. Hair dryers and straighteners are the usual offenders and hotels usually have one anyway.
The socket you will meet
Vietnam is listed with type C and type F: the round two-pin shapes familiar across continental Europe. A universal travel adapter handles them, and so does a standard European plug.
The practical advice is to bring one adapter with several USB ports rather than several adapters. Hotel rooms rarely have enough sockets, and the ones they do have are often behind the bed.
Power banks, and the rule that matters
IATA is direct about this: all lithium-powered devices and spare batteries must only be carried in hand baggage. That means a power bank never goes in the hold, on any airline, ever.
- Up to 100 Wh is generally accepted in the cabin.
- 100 to 160 Wh may be allowed with airline approval.
- Above 160 Wh is usually refused.
Keep terminals covered or the bank in its case so nothing shorts against keys or coins.
Why this matters more than it sounds
A phone in Vietnam is doing several jobs at once: maps, the ride app, translation, the hotel’s messages and photographs. That is a heavy day for a battery, and hotspot sharing makes it heavier still, which Apple’s own hotspot documentation implies when it notes that support varies by carrier and model.
A flat phone at ten at night is not an inconvenience, it is no ride and no address. How the ride apps work is in Grab in Vietnam, how much data the trip needs is in how much mobile data for Vietnam, and the plans are in the Vietnam eSIM store.