The document outlines the history and features of the iPhone, starting from its launch by Apple in 2007, highlighting significant advancements such as the introduction of the iPhone 3G, App Store, and enhanced camera capabilities. It details the technical specifications, design elements, and internal structures of the iPhone 4, along with its environmental considerations. Key features of the device include a high-resolution display, dual microphones for improved call quality, and the powerful A4 chip, making it a groundbreaking smartphone of its time.

1. iPhone

2. History of iphone2007 Apple Re-invents phone The iphone 3G and the App store The iphone 3GS twice as fast2010 The biggest leap since iphone

4. Back CameraFront CameraVolume Up/Down9.3 mmHome button

5. External FeaturesAll new design

6. Stainless Steel for Strength

7. Glass for optical quality

8. Scratch resistant

9. Extra Ordinary Build Quality

10. Integrated antennasAntenna Design

11. Retina Display

12. 960x640 i.e. 326 Pixels Per Inch300 is limit of Human Retina

13. In a word, RESOLUTIONARY!

14. Multi-Touch It can register multiple touches at once to support advanced gestures such as pinch to zoom, two-finger tap, and more.Display Features3.5 inch display

15. 960x640 pixels

16. 326 pixels per inch

17. 800:1 Contrast Ratio

18. IPS technology for superb color

19. Wide Viewing angle

20. Incredibly sharp text & imagesInternal Structure

21. Two MicrophonesWhile most phones have only one microphone, iPhone 4 has two. The main mic, located on the bottom next to the dock connector, is for phone calls, voice commands, and memos. The second mic, built into the top near the headphone jack, is for making your phone calls better.

22. Technical Features1Ghz Apple A4 Chip

23. Up to 32GB of Storage