"calls on other devices"?
iPhone allows you to shunt your calls either to the iPhone earpiece, the iPhone speaker OR "other devices", in my case a couple of Mac desktops and laptops that I have. You give it permission to do that in Settings/Phone. Doing the call on another device works very nicely. The other device handles not only the speaker but the microphone as well. My question is a simple one. How does my iPhone KNOW about those other devices? Where did I tell it that those other devices exist? If I want to add another device, how do I do that? Is this linkage with the other device over Bluetooth, or over the LAN?
iPhone SE