Something is using my data twice a day, every day. What is it and how can I stop it?
There must be some app(s) running in the background. Things like weather apps, location finders, or just the maintenance programs which update your software will do that, but you don't really want to shut off those. If your data is being seriously drained, enable a data saver mode or disable some apps from using cellular data. I always make sure any open apps are closed when I'm done using them, and clear my browser cache if I'm done with web surfing.