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An embedded-SIM (eSIM) is a digital SIM that allows you to activate your carrier's cellular plan without using a physical nano-SIM. It is a data product that can be used at a lower price than roaming services by easily registering an eSIM from an overseas carrier without removing the existing SIM when traveling abroad. If you register eSIM by adding it as a QR code, it will be used immediately. You can use the existing domestic SIM together, so you can receive and send calls or text messages in case of an emergency, and there is no need to remove the existing domestic SIM, so you do not have to worry about losing it.
*#06# on the dial screen → If there is an EID in the device information, eSIM can be used