I wear Phonak Naida Q90UP aids. I have Roger Pen 1.1. I also have two Roger receivers: Roger x for Compilot, and Roger Mylink for my other (Widex) hearing aids.
I haven’t connected Roger Pen to my iPhone yet because I have to carry three devices-iPhone, Roger Pen, and a Roger Receiver to answer or call using Roger Pen. It is much more complex than carry iPhone 6 with Phonak Easycall in the same phone case that you have.
I did some experiments this morning. After I paired Roger Pen with my iPhone, I borrowed my wife’s iPhone. Then I made a call from my wife’s to mine, and vice versa.
I wear Widex aids with Mylink.
I wear Phonk Naida aids with Compilot.
In Both case, when I receive a call, I hear regular bell sound (that I set for my iPhone) through both ears. When I make a call, I hear a simple classic bell sound. It never says who is calling you even though you can see the name on iPhone screen.
I hope this satisfies your curiosity.