Call waiting services not working 😡 even I enabled call waiting services.bsnl 4g phone

[Bujji5677]

I am not getting any notification are any tone as call waiting

[victor010]

Hi, kindly help us with the following information to find a solution to your query.
1.  Name of the Asus device you are using.
2.  Firmware version your device is on.
3. Elaborate more on your concern.

See if following the below steps help with the same:
1. Clear system cache.
2. Try the same under safe mode:
Hold the power button for 5 seconds => When the screen flashes with option => Press & hold power option => You will get an option to restart in safe mode