This information is applicable for all the realme device.
In case, you find that you are not able to receive the notification of the waiting call then you have quick steps to enable this option.
1. Go to the “Settings”, scroll the screen to the bottom level.
2. Find the “System Apps” option.
3. Choose the “Call” option.
4. Then click on the “Carrier Call Settings”, then choose “Additional Settings”
5. Now enable the “Call Waiting” option.
This is how you can resolve your call waiting issue by using simple steps.