try rebooting your phone
or
to complete the Preferred Roaming List update:
Call *228 from your home coverage area.
When prompted, select 2 to update your phone's preferred roaming list. (This process may take up to 2 minutes.)
Once completed, a confirmation message will be played, and a message will display on the phone's screen.
Preferred Roaming List (PRL) FAQs | Verizon Wireless
https://www.verizonwireless.com/supp...t-update-faqs/