Do you have an iPhone 6 Plus which takes blurry photos? If so, then according to Apple you could be owed a fix, due a faulty internal camera component.
Apple’s website notes that the issue in question affects a number of iPhone 6 Plus handsets sold between September 2014 and January 2015. The problem relates to the the iSight camera on the back of the phone, rather than the “selfie” camera at the front.