My iPhone 6 is not working properly. It s working rachetly. When I take a photo, the photo shows gray. When I click for an app it is keeping me wait. Some apps are not working properly as well. The phone is giving error when I try to install an app from AppleStore. Sometimes when I click wake/sleep button, the screen is not being ON (still off). I pressed home sleep button at the same time until I see Apple Logo but nothing changes. And also I reseted phone (by deleting all contents) and nothing changes. I need immediate help. Thank you for ur answers.