Over at the Lightstalking website, there's a list of 46 free photography eBooks you can download right now. Some are specific to DSLR users, but there are many that would benefit mobile photographers as well as they cover the basics of photography in general.
Ultimate Field Guide to Photography by National Geographic
Going Candid by Thomas Leuthard
Set up Your Own Photoblog by Nancy Messiah
The Shy Photographer's Guide to Confidence by Lauren Lim
The Photographer's Guide to Instagram
Selling Fine Art Photography
Get the links to the first 23 free eBooks here and the 2nd 23 here.
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