Connection Issue

I have the new iPhone 12 Pro Max. I work in a large manufacturing facility. We do not have access to Wi_Fi. They have it but we do not have log in access. I recently switched carriers to Verizon. Today my first day with my phone I had no service for any of my apps. I showed 2 bars LTE. Even going towards outside of building phone did not work. I spoke with Verizon they had me do some reset but after phone still did not work. People all around me who have Verizon their phones are working. Anyone have any clue on what I can do for service?