I don't use iPhone 5/5s mockups so often these days, but when I did I often used Alex Sheyn's Slate mockup. I really liked how they were realistic enough to be recognisable, but didn't aim to be true to life.
I came across them again recently when looking for an iPhone 6 mockup, and really wanted to use this style again, so I made a 6 and 6+ version similar to Alex's Slate style.
I've used it recently in this shot:
Free to use.
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