How to use the mobile phone after flying from Chongqing to Jeju Island?

Use international roaming service and Wi-Fi.

Use international roaming service: If your mobile phone supports international roaming service, you can consider using this service in Jeju Island. International roaming service can ensure that your mobile phone can work normally in Jeju Island, but you need to pay the corresponding roaming fee.

Use Wi-Fi: In Jeju Island, Wi-Fi is the most commonly used network communication method. Whether in hotels, restaurants, shopping malls or airports, you can easily find areas covered by Wi-Fi signals. Most of these Wi-Fi signal points are provided free of charge, but some of them need to be used for a fee.