The new iPhone 4 comes with iOS 4, a new moniker for the iPhone OS. The biggest new feature is, of course, selective multi-tasking, Apple’s way to multitask some application features without consuming too many resources and battery power.
1. Official iPhone4 Guide By Apple
To view the guide on iPhone, tap the iPhone User Guide bookmark in Safari or go to help.apple.com/iphone.
Release date: November 22, 2010 Size: 35 MB Pages: 244 pages Type: .Pdf
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2. iPhone 4: The Definitive Guide By Gizmodo
Here’s the exhaustive guide to all the features of the new iPhone 4.