Since getting my iPhone SE my data has gone up from 25G per month to 40G! I am not using my phone any differently than I did my previous phone, which wasn't an iPhone. For example: I used 500mb in an afternoon yesterday and all I was doing was messaging my son, no video. No one else in the house was using it. It seems like there is data usage running in the background somehow. I'm just not techie enough to understand what I'm doing. Please, can someone tell me what to do? In mega-simple tech language please.