iPhone 6S, iOS 11.2.6. Yesterday I couldn't get cellular data and it was showing a PDP error. A Google search suggested resetting my network settings on the phone. That did work, but I can no longer tether to my phone wirelessly from my Mac (High Sierra.) Personal Hotspot is still an option in settings and I can turn it on, it just doesn't seem to work. It's not a problem with my Mac as I can still see other Personal Hotspots from other iOS devices. Any idea why this might have happened and how I can fix it?