The phone is not the problem. Oreo is the problem. My wife and I have the same phone (G5 Plus). She upgraded to Oreo and has had nothing but problems ever since. As a result, I did not and will not upgrade to Oreo. The Oreo upgrade should never have been approved for the G5 Plus. My wife is having this same DNS error when WiFi calling is turned on. My phone is still running Android 7.0 and I have no WiFi calling issues. Give G5 Plus users a way to roll back to Android 7.0 or another 7.x version of Android. That's the only way to fix this problem.
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