Can you use an unlocked phone on tracfone?

My stepdaughters Grandfather bought her a tracfone a while back, we decided this would be a good way to see if she was ready to be added to our current verizon contract (she will be 10 in 2 weeks) and the answer is "No", she goes through minutes like nobodys business, none the less, she hates her phone and wants a flip phone or one with the keyboard. Does anyone know if I can buy an unlocked phone and use her SIM card? I know it would have to be T mobile or AT&T phone but is it possible??
 
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