I know they aren't. It just seems like they "might" become one later this year from what I have read on this site and Reddit(Unofficial and speculative, I know). Whether it happens or not, it'd be nice for Sprint to optimize their towers. I know that the IC area is lower priority than a city like Des Moines or Cedar Rapids, but I know they will get it done and I have faith that they WILL be the #1 or #2 network in 18-24 months like Marcelo says!