I'm speculating here, but if there's something in your My Verizon account for blocking numbers, have you checked there to make sure the number isn't also in there as a blocked number, and remove it from My Verizon as well? Make sure SMS is enabled as well as MMS on your iPhone.
Hey there, Oregon2, I appreciate you reaching out about your text issues. I need to gather some more details to help guide us to a resolution. Has the phone been restarted since unblocking the number? Did you block the number directly through your phone or through the My Verizon app?
-Melissa
The phone has been restarted. I believe the number was blocked through this iPhone.