Hello Szot park guy,
Thank you for posting in the Apple Support Communities. I would be concerned if my iPhone was not connecting to Wi-Fi as well. I found a troubleshooting assistant for this specific issue:
iPhone - Join a network Assistant
http://www.apple.com/support/iphone/assistant/wifi
You can skip any steps that you have already gone through. If you are just wanting to start over with setting up your Wi-Fi network again on your iPhone, you can go to the Reset network settings section and follow these steps:
Reset network settings
- To reset your network settings, tap Settings > General, then scroll down and tap Reset > Reset Network Settings.
- When the device restarts, try to locate and join the Wi-Fi network again.
Note: This will clear your current cellular and Wi-Fi network settings, including saved networks, Wi-Fi passwords, and VPN settings.
I hope this helps get you back on your Wi-Fi network!
Best,
Sheila M.