SKT: HSPA+ 2100, LTE 800/1800
KT: HSPA+ 2100, LTE 1800
LGU: CDMA rev.B 1800, LTE 800
KT officially closed CDMA service at last April (about one year phasing out period) and SKT still do CDMA but not accepting new CDMA account since about two years ago same as KT.
Yep as long as you stay with SKT and KT phone, it is compatible to AT&T HSPA band.
Sent from my SAMSUNG-SGH-I717 using xda premium
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