How can I fix 'No internet connection' on iPhone?
I can't connect to the internet
[Re-Titled by Moderator]
iPhone 13, iOS 18
If you connect to Wifi, doesn't necessarily mean you are connected to the internet. --> Internet not available WiFi and Cellular … - Apple Community
Wi-Fi Assist is on by default. This will automatically switch to Cellular Data if the device is not connected to the internet.
About Wi-Fi Assist - Apple Support