Will a T-Mobile prepaid sim card work with a phone from T-Mobile?

magenta2457445

    Typically I buy my phones unlocked and then use a prepaid T-Mobile SIM card plan for service. But I'm interested in buying a phone on eBay that is Network locked to T-Mobile, would I be able to insert my prepaid sim in the phone and use it right away or does this only work with unlocked GSM phones?

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