Yes voice calls use bandwidth, even when they aren’t digital. There are limits to simultaneous analogue signals over a common frequency/cable, and that was called bandwidth long before there was even a digital world. Hell, even the name refers to the disparity between the upper and lower width of band (set of frequencies with no gaps) which was the original limit of simultaneous reception and transmission.
It’s been way too long. That should read upper and lower limits of a band. At least that’s semi-coherent.
True, however, the difference between streaming an HD video and reading FR shouldn’t affect voice calls any differently... Both are a separate connection, and while simultaneous uses of the spectrum are a concern, the two networks themselves are functionally separate.