I've had my Sprint plan for a few years and I'm grandfathered in to unlimited data. Before I had Internet set up in my apartment, I used 400 GB in one month wit

I've had my Sprint plan for a few years and I'm grandfathered in to unlimited data. Before I had Internet set up in my apartment, I used 400 GB in one month with it tethered to two laptops, a desktop, and a PS3. No complaints and no slowdowns. Are these plans really nonexistent nowadays?