Gophone sim card in a Cingular postpay phone

I own a Cingular GoPhone and would really like to get a new phone. My friend is buying a new phone for his regular service Cingular account, and has offered to give me his 'old' phone (using the term loosely, its only 9 months old). My question is, will my SIM card work in the phone without it being unlocked?

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