iPhone 4 recently "upgraded" to iOS 6 and wi-fi is a no-go. I've tried to downgrade back to 5.1.1 and I've been unsuccessful so far. When I go through the settings menu and opt to turn on wi-fi, it will only recognize my network if I'm plugged into the MacBook Pro. As soon as I unplug it, the phone refuses to recognize my wi-fi network. When the phone is plugged in and I try to select the network, it brings up an apple log in page but the page says; "Hmm, the page you're looking for cannot be found"
Thank you iOS 6 for rendering the wifi option and a number of the apps on my phone COMPLETELY useless.