iPhone User Guide For iOS 7.1
This book can be downloaded and read in iBooks on your Mac or iOS device.
Here's everything you need to know about iPhone, in a handy digital format. Get to know iPhone and discover all the amazing things it can do, and how to do them. It's the definitive guide for getting the most from your new iPhone, straight from Apple. The iPhone User Guide covers iPhone 5s, iPhone 5c, iPhone 5, iPhone 4s, and iPhone 4. It's an essential part of any iBooks library.
What's New in Version 3.0
This really helps
Glad to have this as a guidebook on my iPhone for reference. Many interesting uses for iPhone such as compass, level, stocks, recording device, scientific calculator, visual maps, worldwide clocks, etc. Very useful information.