See this thread (first post) about fully stressing 4G. The Android test apps don't work with 4G very well.
http://forum.androidcentral.com/htc-evo-4g/15481-post-your-highest-4g-performance-test.html
http://forum.androidcentral.com/htc-evo-4g/15481-post-your-highest-4g-performance-test.html
