It’s my goddamn motherfucking mobile data and MY PHONE. I should be able to use it however I want. My wifi went down because the greedy, cunt-faced shitbags at Comcast stole taxpayer subsidies to enrich themselves instead of actually providing the service we’re paying for. I tried to switch to a mobile hotspot and my phone refuses to open one. Everyone responsible for this shit should be fed to alligators locked away in a fucking gulag. We have no rights and live in a corporate plutocracy.
I remember it definitely being a very common thing in USA a decade or so ago. I never knew it disappeared. I don’t think it would ever fly in Europe.
There used to be jailbreak tweaks in the iOS 4 days that would allow you to use it regardless of your carrier.