Can an unlocked IPhone 4 use 3G networks for browsing in various countries

Hey everyone,
Question, if you buy an unlocked version of the IPhone 4 can you simply bring it to other countries, buy their sim card and use that countries 3G/4G network? I've heard that the phone will work but the signal of the 3G network may not work if you buy the phone in one country versus another.
Thanks,
CoZ

The only thing I'd add to wjosten's excellent reply is...
If you are thinking of just purchasing a pre-pay sim, in most parts of the world I travel to, access to the data network of that provider requires a post-pay (contract) agreement. You would certainly be able to make calls & text with a local "pre-pay" SIM, but hooking into the data network typically requires a different plan from that national provider.
My best always,
John

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