I went to Settings > General > Usage to turn the Battery Percentage on, and I notice that the Call Time is 4 Days, 8 Hours. I got the phone 12 hours ago? Does this come over from restoring from a backup? It seems like it shouldn't.
Call Time and Cellular Network Data info are indeed stored in the iTunes backup. This is done so that this info is retained in case you ever need to restore your iPhone and don't want to lose this data for whatever reason.