Nexus 5x not making/receiving calls on Verizon?

Nexus 5x not making/receiving calls on Verizon?

I just got a new 5x in the mail yesterday to replace my Nexus 6. Everything I've read (including here and elsewhere) has stated that simply popping your Verizon nano SIM from one phone to the other should allow Verizon to work on the 5x seamlessly. I popped my SIM in and texts/data is working fine, but I cannot for the life of me make or receive any calls. It just shows "Dialing xxxxx" for about 15 seconds, then the line drops. Has anyone else had this issue? Slipping the SIM back into the Nexus 6 causes everything to work just fine, but I'll be REALLY sad if this doesn't work out and I have to return the phone. :'(