Vikas_00 , via OnePlus 8T , Jan 19, 2021 : Dear Team, Why conference call takes time to connect and don't have option to disconnect any 1 call
Shiva8267 , via OnePlus Community App , Jan 20, 2021 : Try restarting device or clear data of phone app
srini0301 , Jan 20, 2021 : That's totally depends on your telecom operator , for me it's totally fine , I see no delay in call conference .
srini0301 , Jan 20, 2021 : Install OnePlus phone apk file and set default dailer as OnePlus phone instead of Google dailer .
Xcommunicad0 , via OnePlus 8T , Jan 20, 2021 : Try resetting the app(clear storage) but if that doesn't makes any difference then probably it's either of operator or may be due to user location.
psygarden , via OnePlus 8T Aquamarine Green , Jan 20, 2021 : https://drive.google.com/file/d/1LgtOJViVIU2U3WQ6jruGXhsAMNOT1Tif/view?usp=drivesdk This is 1+ Dialer, set it as default Phone app and grant required permissions.