What kind of network does KT Powertel use? (CDMA, GSM, iDEN) If they're offering a 7100i, it sounds like it's a iDEN(Nextel) network. If that's the case, your 8700 won't work due to incompatibility between the device(GSM) and the network(CDMA or iDEN). Even if they were running a GSM network, your BB would need to be unlocked and have a KT SIM card in order to work on their network.