When turning on WiFi iPhone 16 Plus, shows strong connection to home WiFi but comes up showing no internet Connection ?? Then it will connect for a period and then disconnect from internet again. have contacted Provider and all tests have been verified as all working correctly.
iMac 24″, macOS 15.2
Make sure that you have not enabled parental controls (Use parental controls on your child's iPhone or iPad - Apple Support)
In addition, if you have installed any security apps, VPNs, or DNS profiles on the iPhone, then remove them per the app maker's instructions.
Lastly, you can try starting at step 6 in the following document to reset your iOS network settings: If your iPhone or iPad won't connect to a Wi-Fi network - Apple Support
iPhone 16 connects to WI FI but no internet connection
