S1595515134984 , via OnePlus 8 T-Mobile , Sep 14, 2020 : My new OnePlus 8 in2017 worked perfect until the update to version 10.5.20.IN55CB pushed onto it. Since then I can't make outgoing calls. I noticed if I switch the phone to 3G only I can make calls. It appears to be related to Volte on the phone which can't be disabled. Anyone else have this problem?