You can activate an unlocked device as long as its compatible on our network mbt85. You can check if the phone is compatible via the link below. You will need the IMEI number of the phone.
Can I activate my old galaxy S5 on Verizon?
If the phone is capable of VoLTE calls then it might be possible to activate it on the Verizon Wireless network. If not, then you won't be able to activate it anymore.
I'm most definitely NOT a VZW employee. If a post answered your question, please mark it as the answer.