https://discussions.apple.com/thread/8411604A lot of people with broken WiFi as of iOS 11.4?
Strangely enough, especially given the severity of the issue, it doesn't seem to get much mention in discussions here, while let's say some battery issues that are something somewhat less severe and also fairly limited in how many are affected gets a fair bit of discussion.https://discussions.apple.com/thread/8411604
"I have this questions too (758)" including 9 pages of posts and over 1,000 views
This broke immediately after the update to 11.4. You can actually connect to an access point if you're within a couple of feet of it; anything further than that and either the signal is poor and the phone refuses to connect or the phone won't see the AP at all. All other devices work just fine, so it's not the AP. This is happening across all makes and models of APs in multiple locations. Resetting Network Settings and even the whole phone doesn't fix it. I've effectively been without wifi for over a month now.