Your phone is nearly out of battery, and the plug in your bag does not fit the hotel socket. A little preparation can save you that first-night headache. Before buying anything, check the charger you already own.
Start with the electricity, then the plug
The Korea Tourism Organization lists South Korea’s standard supply as 220 V, 60 Hz, with sockets that have two round holes. A plug adapter changes the physical connection; a passive adapter does not change the voltage or frequency.
Read “Input,” not just “Output”
Look at the small print on the charger. Input: 100–240 V, 50/60 Hz includes Korea’s supply. If that is the actual rating on your charger, a voltage converter is not needed for that charger; you may still need a correctly fitting, suitably rated plug adapter.
A label such as Output: 5 V describes what the charger supplies to the connected device. It does not mean that the charger must be plugged into a 5 V wall socket. Apple’s linked manual shows this distinction on one charger; your own model may have different ratings.
Treat hair appliances separately
Do not assume your hair dryer or straightener has the same input range as your phone charger. Never connect a 110/120 V-only appliance to Korea’s 220 V supply using only a plug adapter. Ask your accommodation about a locally suitable dryer, or check the appliance manufacturer’s instructions before packing it.
A converter is not a universal fix. Compatibility, power rating and grounding requirements still matter. Do not exceed the adapter’s stated load or use an adapter that removes grounding required by the appliance.
A small packing check
Read each device’s input label, save a photo of it, and pair the charger with the cable that belongs to your device. If the label is missing or unclear, ask the manufacturer rather than guessing from the shape of the plug.
Message your hotel before departure: “Do you have a compatible plug adapter and a hair dryer?” The tourism board suggests asking the front desk about adapters, but availability is not guaranteed. Keep charging equipment dry and follow its instructions. If a connection feels loose or equipment is damaged, do not keep using it.
The useful question is not simply “Which adapter does Korea use?” It is “Does this exact charger accept 220 V at 60 Hz, and can I connect it safely?” That check comes before the shopping list.
Sources and further reading: Korea Tourism Organization · Electrical Safety First: travel adaptors · Electrical Safety First: South Korea · Apple USB Power Adapter manual
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