Is there any software for android phone for call waiting service option?

[AC Question]

Suppose me and my mother talk with each other from our phone. One of my friend call my phone right this moment and his(friend) phone don't shows that the call is now waiting but the call still running.

 

[Rukbat]

No, your carrier doesn't send back "the call is waiting" data, so there's no software that can detect it.