Reset your Network Settings.
Tap Settings > General > Reset > Reset Network Settings.
This also resets Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that you’ve used before.
Why does my phone say no Internet connection when I have WIFI iPhone?
My iPhone won’t connect to the internet
If your iPhone is failing to connect to the Internet via your cellular data network, try resetting the phone. If that doesn’t solve the connection issue, try resetting the iPhone’s network settings. Go to Settings, General, Reset, and then select Reset Network Settings.
Why does my WIFI keep saying no Internet connection?
Sometimes an old network driver or corrupted one can lead to no internet on connected WiFi problem. To fix network driver problems, Press Window+R keys and enter “devmgmt.msc” to open “Device Manager.” If there is no problem with the router or internet connection, then you should connect easily.
Why is my iPhone not working without WIFI?
2: Reset the Device Network Settings & Reboot the Device
The next troubleshooting step is to reset iOS network settings, and then turn the iPhone or iPad off and back on again. This can often resolve cellular data failures and it’s pretty simple: Open the Settings app and go to ‘General’ followed by ‘Reset’