My son is going to South Africa in the Peace Corps and needs a phone to use as a modem - he'll have cell phone service, but rare electricity and no wired internet.

Amazon is selling the Pixi unlocked for $49. I hear South Africa is GSM only. I'm fuzzy on this whole 'unlocked' thing. He needs to get a new chip in South Africa when he gets there. Can he buy a Pixi here and have it work with a new chip there?