There is Free Classy iPhone 6 Black Mockup for designers and developers. You can paste your ui designs and other designs according to your need. This Free Classy iPhone 6 Black Mockup is designed in smart-object format. Feel free to download and enjoy.

Free Classy iPhone 6 Black Mockup

Free Classy iPhone 6 Black Mockup

Format: Photoshop CS6 (Smart-Object)
Free to use personally and commercially, but link-back is compulsory.