Has it happened recently while updating to latest OTA! Try to clear cache files and reboot the device! Check if that works out!
Settings > system >Reset Options > Reset Wi-Fi, mobile & Bluetooth (it will delete your saved Wi-Fi passwords and Bluetooth settings also so keep that in mind)
And restart your phone.
Does this happen everytime or only when you're calling someone?
it happens all the time and it's happening since the latest update.
i have tried all the methods.its happening since the new update.
after updating latest ota it's showing error! i have tried all the methods but still issue not resolved yet.
Boot to safe mode and see if it showing same there or not.
Share Your Best Shot with 9 / 9Pro - Special Shot On OnePlus event
by Leo X., 2021-04-09