wi-fi/internet connection problems
iphone 13 mini - new - problems with wifi/internet not staying connected..why?
iPhone 13 mini, iOS 15
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If Wi-Fi will not connect
• Reset the router to factory settings (menu or paper clip)
• On iphone Settings, General, Transfer iphone or reset, reset, reset network settings
• If you have a VPN you are strongly recommended to uninstall it and its profile in Settings, General, VPN and device management
Here's some more steps you can try for Wi-Fi connection issues that may be helpful if your phone will not connect to WiFi
If your iPhone, iPad or iPod touch won't connect to a Wi-Fi network – Apple Support (UK)