Will a unlocked samsung galaxy s2 support 3 network SIM card?

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http://androidforums.com – Hello to all, Recently have been quite keen on buying the samsung galaxy s2, but I use a 3 network SIM for my daily use. So I would like to know if I buy an unlocked s2, will it support my sim card? Or will I have to specifically purchase the phone from a Three Store? Kind Regards, Ash (General)