Hotspot turned on by another ios device
There are plenty of posts about Hotspot not working. I have the opposite complaint. Somewhere along the way iOS changed to enable my iPad to turn on the Hotspot on my iPhone even though the iPhone has the Hotspot setting set to off. The main problem is that the iPhone hotspot turns on and stays on. That is crazy! I used up all my data allowance one time because the network order on my iMac had the iPhone at the top (now fixed but so annoying). I now leave Hotspot off but just found that the iPad can over-ride this.
Grrr
iMac (27-inch, Late 2012), OS X Yosemite (10.10.4), null