Just one knob to turn it on and adjust the sound.

My other grandma have an iPhone that she barely know how to use (she still have the old one on the wall she love). I first call her, than tell her to tap the green button if she she want to use camera (switch to FaceTime).

This works great for us to keep contact.

Though both of this is solutions only allow us to initiate the contact. Here the Yayagram is brilliant!