How do I set call waiting on android lollipop 5.1?

[AC Question]

Hello, I have an Elephone telephone. I try to set call waiting as I successfully did with all other phones I had but I am unable to do it this time. Does anyone know how to do that? Thanks

 

[the tall guy]

Hi, what is call waiting? as in - put someone on hold when you're on the phone? or are you referring to call diverting to voicemail?