Same problem on iPhone 7 iOS 14 Beta 3 (as well as Beta 2). No external case, but in my case the microphone stopped working some time ago before the beta update. Sounds like it could be related somehow. That being said, Safari worked just fine prior to iOS 14 Beta, even with a bad microphone. Otherwise with the Beta I have the same symptoms as what everyone else described, including Gmail issues.
yuriav
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Still not fixed in Beta 4 (iPhone 7). Same issues as before
Same issue in iOS 14 Beta 4, iPhone 7