Why won't my Nexus 7 connect to LTE?

[AC Question]

My Nexus 7 won't connect to LTE

I used a sim from a jetpack back when Verizon wouldn't allow the Nexus 7. Everything worked fine for a long time and then I started getting random sim issues. The sim works fine in the jetpack. Nexus won't save APN, says the sim is from "unknown operator". No network connectivity. Wifi works fine. Any ideas?

Thanks!!!
Ryan