I have an iPhone and I am on vacation in turkey and bought a turkish sim card with internet data. Now my phone uses normal data usage but when I turn my hotspot on for my sister which has a samsung s4 with a sim card from the netherlands it uses a lot of my data usage it used like 900mb within an hour.
When I look into her usage it says she used a few mbs within that hour. In fact it says 124mb the whole month. How is this even possible? Could it be that she has a virus?