I've had a problem with wifi since upgrading to IOS 14.1. The wifi signal is strong, but Internet connectivity over wifi is not available - making my new iPhone 11 useless as a wifi device. I've figured out that the problem is due to IOS 14 apparent incompatibility with Cisco's OpenDNS service , which is the DNS service I use to provide some protection to my young family from some of the more 'adult' aspects of the Web. In my router, I had the DNS setting set to the recommended IP addresses of the OpenDNS servers. All other devices on my home network (several Macs, Windows PCS, Android phones, a Smart TV, streaming music devices) all work with OpenDNS. My iphone 11 did too until it received the IOS 14.1 update I had to remove the DNS setting for OpenDNS, and set my DNS service to that provided automatically my ISP for my iPhone 11 (IOS 14.1) to work. I find it ironic that I have to lower the security of my home network and the security of its home users in order to get a device with IOS 14 to work on it. I value the OpenDNS service as it provides some level of blocking of certain categories of content at router level. I can't apparently post a link here, but if you search for 'DNS Resolver Selection in iOS 14 and macOS 11' you will find a link that gives information on this issue.

IOS 14.1 installed last night. The wifi on My iphone 11 is buggy; browsers are slow and timing out. No connection to app store. Chromecast connectivity slow and buggy. In short, this update has incapacitated my less than 3 month old phone. I'd appreciate any steers on this.