iPhone 6 Battle.net app not working

Hey guys I downloaded the Battle.net mobile app on my iPhone 6 and as soon as I go to open it, it shows the Battle.net logo and closes after a second or so, I’m on the highest iOS I can get on my phone and I have try’d deleting the app and reinstalling does anyone else have this problem or know how to solve it? If it helps at all I’m using WiFi as I have no phone service atm.