Y1515011767656 , via OnePlus 5T , Nov 26, 2020 : Hi guys I have noticed some instability for the first time with my phone after recent android upgrade My calls either don't connect or drop out. I have tried disabling WiFi calling Turned of 4g calling Disabled data and WiFi It's still happening. Turned of and on again. Any ideas? O2 network in the UK is showing no problems.