I live in Las Vegas, and it seems like all carriers have good coverage here. I'm not speaking from personal experience, just observing people with phones from all carriers. Personally I'm with Vzn because ATT let all of 08 & 09 go by without upgrading to HSPA 7.2/14.4 or anything, I knew Vzn had a sooner upgrade path to LTE, and ATT continued, and continued to stand still. I like a wireless network to be speedy, not stand still. ATT has plenty, and plenty of billions in revenue to upgrade including backhaul to HSPA+ 21, LTE, their just lazy. And yet a carrier a third of their size has already upgraded to HSPA+ 42.