The Korea Tourism Organization's electricity and communications guide confirms the local voltage, frequency, and outlet shape. Compare those details with the equipment you plan to bring. 

First, will the plug physically fit an appropriate Korean outlet? If not, you need a suitable adapter. Second, is the charger or appliance rated for the local supply? Read its input label or manufacturer’s instructions rather than guessing from its size or the country where you bought it. 

If the label is missing or unclear, ask the manufacturer. Do not treat a travel adapter as proof that a device is compatible.

Look for the word "Input" on the power adapter. A rating such as 100–240V, 50/60Hz includes Korea’s supply, but confirm the rating on your actual charger. 

For example, Apple states that its USB power adapters are designed for 100–240V AC at 50–60Hz. That does not establish the rating of an unrelated charger, a replacement of unknown origin, or every other appliance in your suitcase. 

Also check the cable ends. A correct wall adapter is not enough if the cable does not connect to your phone or power adapter. Lay out the entire chain before packing: wall connection, power adapter, cable, and device.

Do not apply the phone charger’s rating to a hair dryer, straightener, electric shaver, or other appliance. Each has its own requirements. 

If a device is not compatible with the destination supply, follow its manufacturer’s guidance. For a hotel stay, asking whether an appropriate hair dryer is provided may be simpler than carrying extra equipment. 

Avoid buying a voltage converter on the assumption that any model will work with any appliance. The equipment and its power requirements need to match. When uncertain, leave the item at home until you have reliable compatibility information.

Think through an ordinary evening: phone, watch, earbuds, camera, and perhaps a second traveler’s phone. Bring enough compatible cables and a charging arrangement that suits those devices. 

If you use a multiport charger, check its manufacturer’s guidance for supported outputs and power sharing. More sockets or ports do not automatically mean every connected device charges at its maximum speed. 

Do not rely on a hotel providing a particular USB port or loan adapter. Confirm with the accommodation if that is essential to your plan. A compact, tested setup is easier to manage than a bag of cables you have never used together.

Charge before leaving and keep a usable cable in your day bag. If bringing a power bank on a flight, check your airline’s current carriage and use requirements before packing it. 

Save your accommodation address and essential booking details in advance. These backups are useful when you need to conserve battery or put the phone away to charge. 

For connectivity, prepare your Datapang Korea eSIM using the installation email and the installation guide. Check activation conditions before installing or enabling it. Having both power and a correctly configured data line makes maps and translation easier to use after arrival.