Yes, of course.
However, if the price exceeds KRW 1 million, the excess amount must be paid at the time of purchase. (The same applies to all mobile carriers.)
You can pay the money as a lump sum or in installments, and pay with your overseas credit cards as well as domestic debit cards and domestic credit cards.
① U+ Global Chat (Search "Uplus Global" on Kakao Talk/WeChat/Facebook or Click the icon at the top of the page.)
② U+ Global Customer Center (080-851-1004 / English, Chinese, Vietnamese, Russian / 9:00 a.m. to 6:00 p.m. on weekdays)