Cell Phone plan with truly unlimited data - no metering

A further note re Verizon. I recently bought their "unlimited data" plan for my mifi. "Unlimited" of course is limited to 15G useable,followed by soup can technology as a courtesy. When I asked twice,very specifically, whether after 15G I got the soup can or merely lower tower priority as necessary, I was assured,twice, that it was priority,not automatic dial up speed. If ever an outfit was in need of more regulation.......