iphone se problem

Okay, so my phone randomly turns itself off, and a white screen with a black apple logo comes up and it goes all pixelated and sometimes it will go incredibly pixelated as if the screen was broken before going off, and other times it goes less pixelated and is stuck on that screen. When I hard...

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...