In 2011 and again in 2013, Isotrope conducted a project that measured wireless broadband speeds for the State of Utah. The project was funded by the State Broadband Initiative (SBI) of the National Telecommunications and Information Administration (NTIA). This past summer Isotrope prepared a Comparison Report, comparing the results from 2011 and 2013 drive tests.
An excerpt from the report:
Generally, there were several significant improvements in the availability of broadband service in Utah from 2011 to 2013. We see that 3G broadband speeds increased amongst all the carriers, perhaps in part by upgrading 3G technologies at the cell sites, and perhaps in part due to the upgrading of backhaul capabilities necessary to support 4G LTE at each cell site.
You may download the full report from the State of Utah Broadband Project here.