Minimalist iPhone for Sketch
From the author: “There aren’t words to explain how much I love Sketch, I really wish more people use it, cause it improve my workflow in a way I find difficult to express. So I made these iPhone mockups for everyone who would like to try it or already use it. I am using the free trial version right now, you can download from http://www.bohemiancoding.com/sketch/”
Helpful hint: Dribbble users are nice. If the license is unknown, it is usually because they forgot to mention it explicitly; not because they were being stingy. Ask nicely and they will probably allow you to use it.