Troubleshooting iPhone Wi-Fi Network and
Case 1: Weak or low Wi-Fi signal strength.
Resolution: 1. Update wireless router to the latest firmware.
2. For troubleshooting, temporarily disable wireless encryption or security on the wireless router to rule out encryption issues.
3. Tap "Forget this Network" to reset settings for this Wi-Fi network, including the password. Then try connecting to the network again. Note: This can be useful if you identify a network issue and want to prevent the device from automatically using this network in the future.
Case 2: Can’t access public Wi-Fi network.
Resolution: 1. Turn on the phone and turn I on.
2. Check to see if the network is available by tapping Settings > Wi-Fi and choose from the available networks listed there. Note: It may take a few seconds for the Wi-Fi network name to appear.
3. Tap Renew Lease to acquire a new IP address, DNS, and search-domain information from the Wi-Fi network.
4. Reset Network Settings. On the device, tap Settings > General > Reset > Reset Network Settings.
Case 3: Wi-Fi has 4 bars, but can’t access the Internet.
Resolution: 1. Reset router.
2. Check the AP web filter settings.
3. If you are using WEP security and have multiple WEP keys on your Wi-Fi router, try configuring your Wi-Fi router to use only a single WEP key in key index 1.
4. Consider using WPA or WPA2 instead. WPA and WPA2 encryption protocols are newer, more effective security options for wireless networks than the older WEP protocol.
5. Disable 40MHz in the 2.4GHz settings on the Wi-Fi router. Mac computers, iPhone, and iPod touch do not support this mode. Disabling it may reduce interference issues.
6. Join a closed or private network by tapping Settings > Wi-Fi > Other and entering the Wi-Fi network name, security, and password.
7. Verify that you are selecting the correct network if you are in a location with multiple Wi-Fi networks.\
8. If the Wi-Fi network uses MAC address filtering, you will need to add the MAC address to the access list for the Wi-Fi router. The MAC address for your device is listed as the Wi-Fi address in Settings > General > About.