As far as I know, I have all mobile data usage turned off. I set a limit well below how much i'm allowed to use and I have the data usage so that it doesn't have a check on it. I hoped that it would stop being used before it went over the limit of 2gb but after a couple hours of the data being "off", the data went way over the limit somehow. It stuck at 2.005 gb for a while but then went up to 4.598 gb within a day. I don't know why it's doing this or how I can stop it! I only use facebook or other internet type things when i'm connected to wi-fi but it's still rising! What can I do to make it stop?
Read more: Why won't my samsung galaxy s5 stop using data?