R/ Verizon Can I just do this with Gudp.

My Moto Z4 is getting worn out though I like the features and Mods ( and Hotspot) with my gUDP I find it's time for something new.. NOW I looked over Vzw programs and even though I don't use use in excess of 25 GB of HS their prices don't impress me enough to want to sell my soul again after being clean for over a decade. SO , can I just buy outright a 5g unlocked phone that's authorized on their network and swap out the SIM card and be good to go without any plan changes or contract? If not how do I get a 5g sim without hearing I need a new program?