Best carrier while traveling the country
Who you choose is up to you, but for extensive traveling, one of the 'big four' would be the best route to go, since they have more national coverage and less roaming. Though I also know AT&T has almost zero coverage in Nebraska, it's all roaming coverage, so you can keep that in mind too. As far as extensive coverage goes, Verizon would probably be the best bet.
http://www.wireless.att.com/coverageviewer/?wtSlotCl ... »
If you know where you're going to be traveling, you can check each one out to see what coverage is like.
True unlimited package, indeed (unless you read the fine print)