Hi there, Pamlani!
Thanks for reaching out to the Apple Support Communities! It sounds like you are having an issue your iPhone not connecting to a public Wi-Fi properly! Based on your issue and the steps you have tried so far, it would be best at this point to go to this link: Contact Support This will get you in touch with Apple and they will be happy to proceed with further steps.
Cheers!
I am connected to a joint university WiFi (Eduroam) but my WiFi is very funny on my phone. It works in certain locations such as the lecture theatres, but not in my room on my phone, but it does work on my iPad and Mac in all places. I have updated my phone, restarted my network settings and forgot the network and rejoined. What do I do?
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Why is my WiFi not working, and how do I fix it?