I have a warning about a not trusted certificate and unauthorized websites when i try to use imaps

what do you mean by “imaps” IMAP (Internet Mail Access Protocol)? Or something else? A not trusted certificate means that the site you are accessing does not have a valid SSL certificate; it is not a problem on your phone. Are you using a VPN connection? If so, that can cause false positives for this message.

Robve:

This topic has been covered in Apple Community before now.

•Q: Captiveportal.nokia.com - Apple Community

//discussions.apple.com/thread/252109635

Multiple (4) pages mention, additional info about public hotspots, etc.

A suggestion there, implies clues here:

And "Ignore this Network."

Use captive Wi-Fi networks on your iPhone, iPad, or iPod touch - Apple Support

Ah, that’s because your phone is trying to connect to a public Wi-Fi network whose certificate has expired (they expire after 1 day). You need to forget that network, and if that doesn’t fix it, go to Settings/General/Transfer or Reset Phone/Reset/Reset Network Settings. It has nothing to do with the Maps app.