1. Insert SIM Card after arrival
2. Turn on "Roaming"
3. Reboot your smartphone
4. Connect to SK Telecom network, and APN will be set automatically.
5. Most smartphones can automatically set APN. If it cannot set APN automatically, please refer to the manual in the package for setup.
For iOS user, please check if there are profiles installed in the settings. You have to delete the profile to use this card. If profiles are not deleted, it will only display 3G and cannot connect to the Internet.