The link at the bottom has a profile that sets the APN - it might work without it if you reboot tbh but without being in Korea and having the SIM I can’t verify that. It isn’t the app that he’s talking about.
Didn’t see that. Viewed image on phone and didn’t scroll.
I think it depends on the carrier whether APNs are required. Can be automatically set nowadays with iOS 16 according to https://support.apple.com/en-us/HT201699
I think it depends on the carrier whether APNs are required. Can be automatically set nowadays with iOS 16 according to https://support.apple.com/en-us/HT201699