What version of iOS are you running? It needs to be iOS 16.0 or better.
I believe iOS 18.3.2 is current for that phone, but it shipped with iOS 13.
Depending on your phone's settings, it may not upgrade over the air, but needs a WiFi connection to do updates.
Have you searched the
Help Center? Try doing a Google search and adding "site:churchofjesuschrist.org/help" to the search criteria.
So we can better help you, please edit your
Profile to include your general location.