My friend and I ordered two sim cards individually and choose airport pick up service. We arrived this morning and reached the counter and got the sim card. After landing and pass immigration I had contacted online customer service and they helped to activate the SIM card ASAP. So when I got the sim card just need to insert to my phone then it works well. This is very convenient service and Im able to get the sim card right after entering Korea, which is a very good benefit! I will suggest tourists or students who want to travel or stay in Korea to use the service. And if you got the korean address they can even ship to you for free!!! Since I didn't know my address LOL so pick up is the best way for me. :)