The DW & I both have unlimited aircards from Alltel. Hers (purchased in Nebraska)recently switched to Verizon. Mine (purchased in Wyoming) did not. Not sure yet what Verizon will change to when the current unlimited contract on hers runs out. I previously had an AT&T 5gig limit card. Working in Wyoming at that time, coverage was worthless. I use mine on the job and send/receive photos and prints. Lots of them. One month, while on AT&T, I used 12gig and the next month I used 9gig. They were going to put me on "roam restriction", meaning I could not use the card when not on ann AT&T tower. Unfeasible to me, they terminated my contract. I got the Alltel unlimited card and it has worked great! I seldom have signal problems. It even works great where I am now - MiddleOfNowhere, Nebraska! Of course, when in a more populated area where 3G service is available, it works even better.