Recently, a lot of Apple users reported that their iPhone or iPad encountered issues with Wi-Fi such as: greyed-out or “Unable To Connect” and so on after updating to iOS 8. Here we collected some potential solutions you can try to see they solve the issue for you.
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1. Reset Network Settings
Go to Settings > General > Reset > Reset Network Settings.
2. Turn off Wi-Fi Network
Go to Settings > Privacy > Location Services > System Services.
3. Turn Airplane Mode on and off
If it still not works after turning Wi-Fi off and then on again. Try to switch on the Airplane Mode on for about 30 seconds, then turn it off and reconnect to the hotspot.
4. Turn Bluetooth Off
Sometimes Bluetooth can interfere with Wi-Fi speeds so you could try turning Bluetooth off. It won’t fix the issue, but it might reduce it.
5. Update Software
There’s clearly some kind of glitch in here, so Apple is very likely to release a patch to deal with it. Keep an eye on Settings > General >Software Update.
6. Restart Your Device
Hold down the Home Button and the Sleep/Wake Button and restart your device.
7. Factory Reset
Try a factory reset. Remember to backup your data before resetting.
8. Restart Your Router
Turn your router off for about 5 minutes and then turn it on again.
9. Change Your Router Channel
If you have a two channel router then try changing from 5GHz to 2.4GHz. Generally speaking, 5GHz is faster, but with a shorter range. Some people report a better connection on 2.4GHz and a few find an improvement by switching the other way.
If it doesn’t work, try to put your router’s IP into your browser and log in to change settings. Refer to your ISP for instructions.
10. Switch DNS to Google
Go to Settings > Wi-Fi then tap the “i” icon next to your router, scroll down to DNS and tap the numbers, then enter “18.104.22.168”. Restart your device and check if it works.
Coincidentally, we post another article about how to fix the Wi-Fi problems after iOS 7 update, which has aroused heated discussion among users, maybe some of those suggestions can solve your problems too. Here is a link to the article: How to Fix the iPhone 4S Wifi Problems After iOS 7 Update