To forcibly reboot the i Phone i Pad, you just need to hold down Power button and Home button simultaneously until the i Phone i Pad restarts.
After trying all methods mentioned above, you may have fixed the problem "i OS 11.2/11.1/11/10 not connecting to Wi-Fi" or "i Phone i Pad not picking up Wi-Fi", and can connect your i Device to your Wi-Fi network.
If you still haven't, you can try to connect a Wi-Fi network in a different location.
4) Backup and Restore i Phone i Pad Although it is a tough and time-consuming process to back up and restore i Phone i Pad, it does can fix Wi-Fi not working problem when resetting network and rebooting devices has failed.
Because your i Phone i Pad Wifi won't turn on, you can't make backup with i Cloud, you have to make it with i Tunes.
To check software update on your i Phone i Pad: Settings Reset Network Settings.
Once you tap on this button, this will reset all network settings, including Wi-Fi passwords, VPN and APN settings.5) Restart Your i Phone/i Pad, Router, Cable/DSL mode If you still fail to connect your i Phone i Pad to Wi-Fi network, you can try to restart these devices and equipment: Reset Network Settings.This will reset Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that you have used before.If you are stuck any Wi-Fi or internet problem like, find your i Phone/i Pad Wi-Fi not working, unable to join network, i Phone/i Pad not connecting to Wi Fi, Wi-Fi won't turn on, Wifi grayed out, etc., read this guide to find solutions to fix them in minutes.These solutions also work with i Phone X Wi-Fi issue.There also was a really big problem with the i Phone connecting to cell towers that was resolved through carrier updates.