Can I use a “republic wireless phone” in republic wireless even if it doesn’t say it is supported? I am looking into getting one but I don’t know if I will be able to put it onto republic wireless.
If you are referring to previously used legacy Republic specific phones (Moto E1, E2, G1, G3, X1, X2), then (with the exception of the DEFY XT), yes. Some guidance for acquiring those here: Buying and Selling Used Republic Wireless Phones.
If you already have one of these phones: Activate My Phone. If you weren’t the previous user of the phone, starting fresh with a Factory Reset is best practice. Legacy Republic phones activate on these plans: Republic Wireless Plans 2.0: Republic Refund.