....see if iOS 15.1 is offered — it should be. If it is, there is no reason not to go ahead and install it and the upgrade is recommended. Who knows, it might correct the error that is causing your problem.
OS 15.1 now installed on both phones and the problem has gone away. However, it was not due to the OS update. The carrier advised that, because of very high winds on the lower mainland due to extreme weather, some of their cell towers were damaged and they were experiencing network outages.
