Why ASUS ZENFONE MAX PRO M1 not support CALL WAITING SERVICE.

[VEL_ASSA]

I updated Android 10 beta 2 version 424.
How to fix this call waiting service issues.

[VEL_ASSA]

[Aravind_s]

Same problem how to solve this for BSNL number 

[Y_ASUS]

Hi svela003@gmail.com,
Please refer to the suggestions above. Is the problem improved?

[boomiprakash85]

It was shown already enabled. {Call waiting service }
But not working in my BSNL number