My Galaxy SIII (VZW 4G LTE) rarely runs more than 400-500 MB/mo, but like others above, it's almost always on wifi (home, office, client offices, public hotspots). But my wifi use is typically 5 - 8 GB/mo. Interesting, when I first got it the SIII was on Ice Cream Sandwich and usage was much higher. Jelly Bean seems to keep usage lower, though I'm not aware of any differences in the way I use it.