I want to purchase a mobile prepaid SIM card in Seoul but I missed my chance at Incheon Airport as I arrived at the counter just 2 minites before it is closed.
So I tried purchasing it once I enter the city, but out of three major carriers, SK Telecom and LGU+ declined it since they cannot sell it for travellers. As to olleh, they sell but only a limited data plan. At the airport, they offer an unlimited plan so I declined it.
Also some of them encouraged me to purchase EG SIM which is sold at convenience stores, but since I hate 3G and it is not unlimited plan, it is not within my choices.
So my question is the following:
Can I still purchase it once I left the airport?
Can I go back to the airport just to purchase it? It is no longer the arrival date but does it have any problems?
If I can go back to purchase it at the airport, can I purchase it at Gimpo Airport, not Incheon, which I arrived at?