iOS Help: I accidentally deleted a photo off my iPhone, how can I get it back?

[iMore.com]

Welcome to our new iOS Help feature. Every week I'll try and help you fix the problems you're having with your iPhones and iPads. If you have a question or issue you're having trouble with, I encourage you to email us at ioshelp@imore.com.
This week's question comes to us from Sascha:

Hello. I was trying to free up some space on my iPhone and so I deleted a bunch of photos but I accidentally deleted a photo that I shouldn't have. Do you have any idea how to get it back?
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