Moto G Play XT1607 4th Gen. 16GB Smartphone (Unlocked) I may be able to get one fairly cheap.
this is an approved phone for BYOD Bring_Your_Own_Phone_FAQs
Moto G4 PLAY (XT1607)
- (Apps → Settings → About phone → Hardware information → SKU)
you will need a SIM Bring your own phone to Republic! | Republic Wireless
or from Amazon Republic Wireless SIM Starter Kit
all BYOD are GSM pased networks at this time Coverage Check GSM | Republic Wireless