Need help in USA and need to know what frequency I need GSM wise

Hello I have a random question and maybe someone can help me here I am trying to find out what frequency I need in order to buy a phone that is unbranded from china to work on gsm based sim card so like unlocked for T-Mobile at&t family mobile and so on and so fourth I have looked all over the web and yes have found many answers but it does not make sense to me like do I need duel band quad band 850/1900 MHz I'm so confused any answers would help Lol thanks

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