USM is the only MVNO I've seen that actually advertises QCI tiers. I had to look the term up when I was initially considering them, as I'd never even encountere

USM is the only MVNO I've seen that actually advertises QCI tiers. I had to look the term up when I was initially considering them, as I'd never even encountered it before. It was a major factor in finally feeling confident I wouldn't be giving up too much by leaving AT&T.