It is a service to unlock iPhones that are locked to an carrier KT/SK Korea. After full unlock your iPhone can be activated on any SIM card of any carrier.
WARNING: This service is not possible to unlock the IMEI, which is locked to another country or operator. If you make a mistake, you do not return the money.
To know the operator and the country to which the iPhone is locked, order service Apple iPhone info by IMEI [GSX]. Or you can order the test on the black list - Checking the iPhone IMEI on the blacklist (Blacklist yes\no). This test gives the same information as the checking of IMEI, as well as data on the availability on the black list. Models Blacklist (black list) - these models to which the operator were financial claims (unpaid contract), or the phone has been lost / stolen.