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What's new in iPhone 4.0

This is my first article so please forgive me if there is any mistake. Please comment so i can understand or update my article if there is any mistake. Thanks in advance for your support.

This article summarizes the developer-related features introduced in iPhone OS 4.0. This version of the operating system runs on iPhone and iPod touch only and does not run on iPad. In addition to describing the new features, this article lists the documents that describe those features in more detail.

Note: iPhone OS 4.0 does not support iPad. It runs only on iPhone and iPod touch devices.

For the latest updates and information, you should also see iPhone OS 4.0 Release Notes. For the list of API differences between the iPhone OS 4.0 and earlier versions of iPhone OS, see iPhone OS 4.0 API Diffs.

Here are some new feature which added in iPhone 4.0

1. Multitasking
2. Integration Technology
2.1 Local Notification
2.2 Event Kit
2.3 Core Motion
2.4 Data Protection
2.5 Core Telephony
2.6 iAd
3. Graphics and Multimedia
3.1 High Resolution Screen Support
3.2 Quick Look Framework
3.3 AV Foundation
3.4 Asset Library
3.5 Image I/O
3.6 Core Media
3.7 Core Video
4. Core Services
4.1 Block Objects
4.2 Grand Central Dispatch
4.3 Accelerate Framework
5. XCode Tools
5.1 XCode Improvements
5.2 UI Automation API
6. Framework Enhancements
6.1 UIKit Framework Enhancement
6.2 Found Framework Enhancement
6.3 Game Kit Enhancement
6.4 Core Location Enhancement
6.5 Map Kit Enhancement
6.6 Message UI Enhancement
6.7 Core Graphics Enhancement
6.8 ICU Enhancement
7. Inherited Improvement

We can discuss this features in detail later.

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