I'm coming from the Nexus 4 that only had 4G. My data limit from AT&T is only 3GB. I've had my S5 now for almost a week and I have used 480MB thus far. With my Nexus 4 I would use that same amount in almost 2 weeks. Does the S5 with LTE use more data? Does LTE use more data for some reason? This is my first LTE enabled device.