I'm thinking about buying a second-hand smartphone before I leave Korea since some major brands are based here and Koreans seem to always want the latest and greatest I'm assuming models one or two years old might be resold at low prices.
But I also know mobile phones can be on totally different systems in different countries, and perhaps this is complicated further in the case of smartphones - I'm quite ignorant about all that stuff.
Assuming I can find an unlocked phone, will I be able to take it home and use it?