Why do I have 4 circles under my battery icon

If it is something like this:

it means that you're using your Personal Hotspot.

See also this support article and look at ALL the symbols that might appear on an iPhone:--> Status icons and symbols on your iPhone - Apple Support

Regards

Giulio

4 circles? Please send us a screenshot, so that we can see them.

Regards

Giulio

No idea about that.

What happens if you test your home page using a different Wallpaper?:--> Change the wallpaper on your iPhone - Apple Support

Let me know how it goes

Regards

Giulio

My pleasure :)

Giulio