http://www.droidviews.com/how-to-root-u-s-cellular-galaxy-s4-sch-r970/
Nice, functional root page for the US Cellular (USCC) Samsung Galaxy S4 SCH-R970. Haven’t checked into it much to see what flags it sets, but the instructions seem to work well, and ChainFire has been around long enough I consider them fairly reputable.