Screen turned Black
hello Apple, I started using the IPhone 6s Plus from december 2015, today i see my screen just turned completely black. I'm still able to talk to speak to Siri. when I tried to call my phone from another phone, my IPhone rings however it doesnt display anything Is there anyway to fix this. Or will At&t give me a replacement if I go into the store tomorrow?
iPhone 6s Plus, iOS 9.3.1