Will an Unlocked iPhone work oversea?

Refurbished iPhones with the mention Unlocked would work internationally with most providers (you have to double check for the GSM band, because it can change from a country to the other).

Here's an article that can help you:
http://www.nomadicmatt.com/travel-blogs/smartphones-for-travel/
http://www.ebay.com/gds/Unlocked-iPhone-Buying-Guide-/10000000177629679/g.html

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