If this issue wasn’t there from the start, a factory reset should be able to clean this up.
The factory reset would delete your data, the Apps you installed and their data as well as user settings. After a reboot the phone would start with the initial user setup again, as it was at the very beginning.
The OS is left untouched and stays the same. It can be reinstalled as a step further in case a factory reset isn’t enough to remedy the issue.
A case for https://esim.me/, perhaps?