iPhones also turn on your wifi connection on your laptop.
It is called instant hotspot. Very annoying as it causes connection issues with Outlook and our database as Windows is switching back and forth between wifi and a wired connection causing disconnects for our database. We turn off the wifi and the iPhone turns it back on in a few minutes.
That's on you. . . and Windows ineffective ability to prioritize a wired connection over a wired connection. A Mac has no difficulty with that or having both connected at once. Simple solution, turn off your iPhone's hotspot when you don't need it: Settings/Hotspot —> off. When you need it next reverse that setting change. The default is OFF.
For your computer to have ever connected to the iPhone's Hotspot, you had to have entered the complex iPhone's Hotspot WIFI password. So this is entirely ON YOU!
You can also tell your Windows PC to forget that WIFI connection.