All SIM's the same ?

Hello all, I am not knowledgeable about cell phones, but anyway, I am a tmobile user, and recently my Razor ended up in little pieces. long story, but rather then purchase another Razor from t mobile, I am looking into an unlocked GSM phone online. My question is will my SIM fit in like a Sliver or any other phone that T mobile doesn't sell ? Thank you for your time

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It will work in an unlocked GSM phone, such as a Cingular branded one.

Be careful though when purchasing one online. Make sure the phone specs list the 850 and 1900 bands before purchasing. Otherwise, you may have issues with your coverage.