Reset Network Settings does not work
Today, my phone has been unable to connect to a cellular network. I can browse the internet and text when connected to my wifi at home, but cannot call. No connection at all when I'm out, just an endless "searching." The phone told me I needed to install the iOS update for it to work, which I had not done for a bit. During the install, it stopped and told me that it failed. However, now when I look to install again, it says I am up to date. Despite all of this, I am still unable to connect to a cellular network and now have no way to update the phone.
The most common example seems to be Reset Network Settings. When I click this option in my settings app on my phone, the app crashes and I am unable to proceed. I also tried forcing it to update through plugging it into my PC, but it says there are no new updates and I am unable to. Please help.
iPhone 7, iOS 13