Will an unlocked iphone work in all the countries in the world?

Usually when people list 'unlocked' on an iPhone site they mean unlocked for United States countries. If I buy an unlocked iPhone abroad in Europe (or from a European person selling through amazon or ebay), will it still work in the United States on a local carrier?

I don't think so. European countries have different cell phone frequencies than the US, if I remember right.

Depends on what frequencies the carrier uses and what the phone supports. It may be able to receive calls but not get 3G or LTE data, for example.

Just for the record, the United States is 1 country. That's it.

Also, in my experience an unlocked phone means it works worldwide, not just that 1 country. Its either that or locked, which means it is able to only work on 1 carrier (e.g. AT&T).

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