"iPhone Blue Icon at the top right of the screen on homescreen and in all apps: Thanks for helping me out."
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You are welcome.
Modifier Keys:
"The settings were correct. What I had not realized was how iPhone behaves re. modifier keys.[...]"
You toggled this on, and then this occurred, and I assume it was done intermittently. If this seems inefficnely, then let Apple know
GUI of iPhone"
"On the same token, the entry field for sim pin is light grey on white. How anyone is supposed to see this field eludes me."
That's the default GUI (Graphical User Interface of iOS26. You can change it, such as using dark mode: Use Dark Mode on your iPhone and iPad - Apple Support. If you think it should be different, then let Apple know about that...
So, Provide your POVs to Apple:
Do your Part: These are user-to-user forums. Apple rarely reads these forums on their own time as it is. So, provide Apple with feedback on this. Apple wont get back to you directly, but the more they hear of this, the more they will know what their customers prefer, and what changes to make in releases to come. Apple will know nothing of your ideas, if you don't provide them to them.
To Provide Feedback:
- Go Here: Feedback - iPhone- Apple
- Select: "Feature Request" for the "Feedback Type"
- Comment: that you want this to different, and how so. Include the URL of this thread.
- Proceed form there as necessary