Connection
My iPhone connected to wifi but there is no internet I cannot open anything while other devices in the home connected and have internet
iPhone 6, iOS 12
... and this one is indicating that although your iPhone is connecting to the Wi-Fi network, it is not getting out to the Internet. Most likely this is a configuration issue with your wireless router OR it is not configured properly for that same wireless network.
For example, do you use a VPN on this phone? If so, have you tried disabling it to see if it can make it out to the Internet. If not a VPN, do you use some type of proxy setting on this phone?