I've been connecting by Bluetooth on three different iPhone devices to play the audio from my phone through a Dell Windows 7 Enterprise laptop for three years. I paired my iPhone 4S with my dell Windows 7 enterprise laptop, then my 5S, and then after just grading to the iPhone 7, set up by restoring from my 5S back-up, connected effortlessly without even needing to re-pair the device. I've been able to connect the two and watch video on the phone and listen though the laptop or just play audio through the phone into the laptop and listen on headphones connected to the laptop. Now with a new dell windows 7 enterprise laptop I cannot successfully pair of them.
I used my 5S, later in its life, occasionally as a hotspot for my laptop, but I never had with the 4S. I will try connecting for hotspot tomorrow.