I recently switched from AT&T to Verizon and ported over my number, which was confirmed through Verizon it was completed. Went from a iPhone xs to a Note 9, also confirmed I was unregistered with Apple and imessages. I have talked to Verizon for hours and they haven't seen something like this before, I can call and get calls and when I text people recieve them they just cant send back. I have troubleshot it several times from reboot, to mobile networks, to messenger apps. I'm stumped any help would be appreciated, I have a new phone and cant even message anyone!