Any good books/guide on Smartphone photography?
Would be also nice if you could post your proudest smartphone snaps
Compared to any cell phone, yes.
There really aren't going to be any books or guides about it. there isn't much to it. You lose control over a ton of the aspects of photography in most cases, and a lot of it is just common sense regarding knowing the limitations you're dealing with. Stay in good bright light, take photos that don't rely on a ton of detail and range, stay with photos that work with a wide angle lens, and focus heavily on composition and spotting good scenes and stories. There's your book.
Sternfelds iDubai was shot with an iPhone, no idea if that's what you are looking for