I am trying to move a LG V40 ThinQ from ATT to Verizon. I have received an unlock code and unlocked the phone. However when I install my Verizon SIM card it shows signal but will not send or receive calls or messages. I checked the APN settings which show verizon network but the verizon network is not an option in the network operators tab. Additionally, when I restart the phone it is still showing the ATT logo. Any advice on how to proceed? I had similar issues moving a galaxy s8.