Why don't I see any 'add call' icon whenever a call is connected?

A

AC Question

why dont I see any 'add call' icon whenever a call is connected?

Ive just changed from blackberry 10 (Z10) to android (S6).

I want to constantly connect small teams by adding calls, and do a kind of mini conference. I used to do that pretty intuitively with blackberry....but totally not able to do with my S6. I checked the net for some answers. The main answer I got is that whenever a call is connected, a new icon appears..called 'add call'.

But it doesnt appear. At least not on my new S6. Thats the problem. Will greatly appreciate some help.

Thanks,
Jayant
Gurgaon India