I've always resorted to using some bitmap version of an inaccurate iPhone 4 display. A lot of them have notches out of place, their border radiuses are off, or they don't have the right sensor for revised white model. There's lots of good Photoshop versions out there yet none for Fireworks, so I spent some time last night working up templates.
It's entirely vector based, and inside are two pages - for both Retina and Normal. I'll probably redo them again when the iPhone 5 gets announced.
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