A week ago, we reported some of the users complained on Apple's discussion forum about the Wi-Fi issue after upgrading to iOS 5. A few readers also mentioned they experienced similar Wi-Fi problem and the issue is not limited to a particular iOS device that it seems to be affecting iPhone 4S, iPhone 4, iPhone 3GS and both generations of iPad.
So far I do not experience this issue. My iPhone 4 and 4S work great on iOS 5 without any connection issue. I believe the problem may be due to a glitch in iOS 5 and happen on some models of wireless routers. For those experiencing Wi-Fi connection issue, while you are waiting for Apple's bug fix, I suggest you to try out the following solutions. Probably they may resolve your Wi-Fi connection problems.
1. Restart Your iPhone - Sometimes a simple reboot may rectify the issue. Press and hold the SLEEP/WAKE button on the top. Swipe to power off the iPhone. After that turn on your iPhone again.
2. Forget the Network - Remove your current Wi-Fi network in the Setting and re-configure it again. Go to Settings -> Wi-Fi. Select the existing network and tap Forget this Network.
3. Reset network settings - Go to Settings -> General -> Network -> Reset -> Reset Network Settings.
4. Erase All Settings - If the above doesn't work, try to erase all content and settings. You can go to Settings -> General -> Network -> Reset -> Erase All Content and Settings.
5. Restart Your Wi-Fi router - Sometimes it may not be the issue of your device. Instead it may be a problem of your Wi-Fi router. So try to restart your Wi-Fi router to see if it works.
6. Disable WEP/WPA security on Wi-Fi router - Try to disable all security protocols, reboot the wireless router and reconnect your iPhone/iPad over Wi-Fi to see if it works.
7. Setup Your Wi-Fi Network Manually - Usually your device can automatically detect the available Wi-Fi network, however, there is an option to setup the connection manually. Go to Settings -> Wi-Fi -> Other (under Choose a network). Key in your network name and select the appropriate security protocol (e.g. WPA). Try to join the network again.
8. Use Static IP instead of DHCP - Sometimes your iPhone shows you've connected to the Wi-Fi network but you fail to access the Internet. It's very likely your iPhone fails to get an IP address from the Wi-Fi router. In this case, one workaround is to use static IP configuration instead of DHCP. In the Wi-Fi Settings screen, tap the blue arrow of your network to access the detailed setting. Tap Static (instead of DHCP) and fill in the IP address and other settings manually. If you need to go through the HTTP proxy before accessing the Internet, you'll need to configure the HTTP Proxy setting.
Do the suggested fixes help? Remember to let us know.
The original post was published on Simon Blog.