Cannot connect to wifi after resetting network settings
I had that issue on an iphone 5 a bunch of times. All the other apple devices worked just fine. Very frustrating. There's a thread on one of the support forums with hundreds of replies from folks with similar issues but no real solutions. We replaced the router as well but that did not fix it. After the phone was replaced with same model it went away so I think it may have been a hardware issue. When I had the issue, a workaround I found was to use 5GHz only as the 2.4Ghz gave the issues but the 5GHz did not. HTH