Give away my old 3G iPhone

Hi, I live in the US and I want to give my 2 year-old 3G iPhone to a friend in Poland, would she be able to use it with a local carrier over there? If so, do I need to tweak anything (frequencies etc.) over here before I send her the phone? I'm a complete moron when it comes to phones, please explain accordingly hahaha

Thanks!

Macman756 said:

It has to be unlocked.

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How do I do that? Where can I take it to get it unlocked?

Thanks.

Macman756 said:

If your contract is fulfilled call AT&T.

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Will do. I will ask AT&T on Nov. 13 when my contract is up and they give me my new iphone.

Thanks a ton, Macman!