I have an iMac (I believe it’s a 27 inch Retina display) that I use infrequently. I have an iPhone SE with a data plan. Today, the iPhone’s Personal Hotspot was turned off and I used the iMac.
I was surprised to see that the iMac offered, under the Wi-Fi menu, to connect to the iPhone. I confirmed that the Personal Hotspot was off, and told the iMac to connect. It did, and the iPhone dutifully reported one connection. It also showed the Personal Hotspot was on. I turned off the Personal Hotspot and again told the iMac to connect. It did, and again the Personal Hotspot was on.
This strikes me as extremely odd, and troubling. Why would the iMac be able to detect the iPhone if the Personal Hotspot is off, and why would the iPhone turn the Personal Hotspot on in response to the iMac? At most, I would expect the iMac to whine about the Personal Hotspot being off and the iPhone letting me know something wanted to connect, but I absolutely believe that if I turn off Personal Hotspot on the iPhone, it should stay off (until I turn it on, on the iPhone).
While I don’t doubt that I did, at one time, use the iMac to connect to Wi-Fi on the iPhone, I don’t recall doing so. However, I have used a MacBook to connect to Wi-Fi on the iPhone, and the MacBook does not show the iPhone in its Wi-Fi menu when Personal Hotspot is off.
Any ideas what is going on?