Just a heads up to everyone on here. I haven't been using my Pro1 but I'm on Verizon and faced many of the same issues you've all brought up in this thread.
Recently I picked up a Surface Duo and was having the same issues (outbound text works, inbound doesn't, etc), and a Verizon tech had us chat in and request "CDMA-LESS" activated on our accounts. This took me 5 minutes and suddenly everything started working perfectly. I moved my SIM to my Pro1 today to see if it improved things and it appears I'm sending/receiving SMS/MMS and all that without any special modifications. Just an