Hello. I have had a very difficult time trying to figure out this answer with asking Apple reps and doing loads of research online. I would like to purchase an iPhone 4s in the US. I may move to S. Korea in the future and want to be able to use it with a local carrier there. I believe I can buy a new/used factory unlocked iphone and everything should be okay - is this correct? However is it a good idea to buy a cheaper used iphone that is locked to a carrier then jailbreak/unlock it and take it to Korea? Is this feasible and easy enough to do? Thanks for helping me clear this up.