Korean SKT SMS failed to send/receive, need help ?

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I'm using SCH - M715 (called as T*Omina 2) same spec with GT-i8000 or Omina 2 i8000 international. This is domestic of Korean Version

I've flashed with an English ROM from internet called M715_korean_to_english.rar
Everything is going quite smooth except SMS service stop working. I searched everywhere and found that all Mobile network in Korea, they use their all SMS system with 80 charaters, that will not work with general SMS application on WM6.5.

And I found some solutions on xda forum but it is for X1, HTCTouch ...to work with SKT SMS but not success with M715. So I ask for any help to make SMS works on my M715 English ROM ?

Thanks in advanced,

to many viewer but there is no solution ? or comments how to solve the issue.