You are possibly here because your phone is not displaying incoming calls and sometimes you only hear your ringtone and a missed call. Well, Doris has a few fixes for you.
Restart the phone
Before you touch any setting that will complicate your settings, press the restart button. It is advisable to do the normal restart rather than hard restarting (rebooting) your phone. When you restart your phone, 90% of the cache automatically clears itself freeing the memory.
Turn on Call notifications
There could be a possibility that you accidentally activated the DND (Do Not Disturb) mode disabled your call notifications and you need to turn them on. To turn them on you will go to Settings>Apps>Phone Services/Call management/ phone>Notifications>Activate the ‘Allow notifications toggle’
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In case of step 1 fails to solve the problem, you can then now manually clear the cache. Follow the following steps.
Go to Settings>Apps>phone services/phone/call manager>Storage>Clear cache
This should relieve the call manager’s memory.
This step should only occur when you have tried all the above solutions and they have failed. This is because it permanently clears all the data in your phone manager data including your call history and will reset your phone app settings.
Go to Settings>Apps>phone services/phone/call manager>Storage>Clear data/Storage.