I upgraded from an Iphone 4s to the Samsung Galaxy S5 a few weeks ago and all of a sudden I'm flying through data. I went online today to research further and found that I'm being charged data while I'm connected to WiFi at home and work...even overnight while I'm sleeping and not even doing anything with my phone! How can that even be possible!?! This issue needs to be resolved ASAP as it's completely fraudulent. There's absolutely no reason i should be getting showing data usage while connected to WiFi.