It is not the Samsung Galaxy S2, GT-i9100 or the G, M, P or T variants. From the screenshots it looks as though it has been rooted and running a custom ROM, (possibly in an attempt to use it outside of Korea), and the model version, SHV-E120S, would indicate that it is indeed the Korean LTE variant of the Galaxy S2, as shown
here. IMHO, unless you are going to use this in Korea, its usage may be limited as indeed would support also be.