Yesterday was the first day that customers could pre-order the new IPhone 4 from either Show's website or by going into a store. According to this article from the Joongang Daily, over 110,000 phones were pre-ordered in 9 hours. It took the Samsung Galaxy S, offered by KT's rival SK, 5 days to reach that mark.
SK had enjoyed a boost in sales, especially of the Galaxy S, after the IPhone 4 release date was pushed back, but it seems that now KT is battling back pretty strongly. With the new release date likely in the next few weeks, it remains to be seen which company will end up on top.
You can read the full article here.