What troubleshooting steps have you tried?
First step: Reboot the phone.
I'm most definitely NOT a VZW employee. If a post answered your question, please mark it as the answer.
Hello Tpan. We're truly sorry to learn that your phone has lost LTE connection. Here's a link with some troubleshooting steps to try: https://www.verizon.com/support/apple-iphone-11-pro-max-troubleshooting . Please be sure to let us know if further assistance is needed.