Cell phone question for cricket wireless?

My son and I currently just have Net 10 pay as you go wireless services and both have 2 pretty decent Samsung slide phones. We both don't use the phones much but now I'd rather swirch to Cricket wireless to get on unlimited talk/text monthly plans. Was wondering if I were to do so if we can still use the phones we already have or if we have to buy phones from Cricket? or if there was plans now where we can get 2 fre phones? Any input would be appreciated. thanks
 
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