Counter-intuitive though it may seem, taking a light source and putting it right up close to your subject’s face – as close as you can without getting it in frame – makes for softer light. Why? Because it makes the light bigger in relation to the subject. If that subject is a face, a bigger light can “wrap around” its contours and fill in its own shadows.
And the Photojojo Pocket Spotlight is a big light source for your iPhone.