I study in korea now, at first I have no idea where to get a sim card that I can use for long term when staying in SK. Then my friend suggested me to get one from chingumobile. She said the price is reasonable for students. So I compared the price with other companys‘, It is like 2,3 times cheaper then others. So I visited chingumobile, and did a 4 month plan. And recharge every 4 months. I am fine with the plan I thinking it is really good for foreing students as well.