Check out the following post
http://wheelingit.wordpress.com/2013/05/12/cheap-cellphone-service-with-straight-talk-saving-severing-verizon-ties/
http://wheelingit.wordpress.com/2012/11/04/internet-connectivity-on-the-road-our-new-rockin-no-contract-4g-upgrade/
and
http://www.technomadia.com/internet/