Originally Posted by Atma
Welcome to the forum ej
Which S4 do you have? the i9505 recently got an update in germany.
You may benefit from a factory reset. When I first got my T-Mobile S4, it was using all data as hotspot data and I didn't notice it until I was almost out of hotspot data. T-Mobile tech had me do a factory reset and that fixed it. Maybe you're in a similar situation.
In phone settings says my phone is I545, I have no clue about an update, but I just took this screenshot right now. Still 48 hours ave not passed since this fone was activated, 650mb used by os and results in 1.03gb toral in less than 2 days