iPhone 3G

Developer	Apple Inc.
Manufacturer	Foxconn[1]
Slogan(s)	"The iPhone you've been waiting for." "The first phone to beat the iPhone." "Twice as fast, for half the price." "The most advanced mobile OS. Now even more advanced." "New features, new price."
Form factor	Slate
Generation	2nd (2G)
Model	A1324 (China) A1241
Release date	July 11, 2008
Units sold	1 million over first weekend
Operating system	iOS 4.2.1 (build 8C148) Released November 22, 2010; 13 months ago No longer supported; third party operating systems available
Power	1150 mAh, 3.7 V Internal, user inaccessible Rechargeable Li-ion
CPU	Samsung 32-bit RISC ARM 1176JZ(F)-S v1.0 620 MHz Underclocked to 412 MHz
Storage capacity	8 or 16 GB flash memory
Memory	128 MB eDRAM
Display	3.5-inch screen (diagonally) 320-by-480-pixel resolution at 163 ppi 2:3 aspect ratio 18-bit (262,144-color) LCD
Audio	3.5 mm TRRS One speaker 20 Hz to 20 kHz frequency response (internal, headset) Microphone
Input	Multi-touch touchscreen display 3-axis accelerometer Proximity sensor Ambient light sensor Microphone Headset controls
Connectivity	Quad-band GSM/GPRS/EDGE (850 900 1800 1900 MHz) Tri-band UMTS/HSDPA 3.6 (850 1900 2100 MHz) Wi-Fi (802.11 b/g) Bluetooth 2.0 + EDR USB 2.0/Dock connector
Online services	App Store, iTunes Store, iBookstore, MobileMe
Dimensions	115.5 mm (4.55 in) H 62.1 mm (2.44 in) W 12.3 mm (0.48 in) D
Weight	133 g (4.7 oz)
Predecessor	iPhone
Successor	iPhone 3GS
Related articles	iPad, iPod Touch (comparison)
Website	apple.com/iphone

The iPhone 3G is the second generation of iPhone designed and marketed by Apple Inc.. It was the successor to the original iPhone, and is succeeded by the iPhone 3GS. Introduced on June 9, 2008 at the WWDC 2008 at the Moscone Center, San Francisco. The 3G was very similar to its predecessor, containing the same 2 MP camera and no support for video recording, and its performance was limited by the same 128 MB eDRAM memory unit.^[12] Nevertheless, the 3G featured several improvements over the original. It supported Assisted GPS, 3G data and tri-band UMTS/HSDPA.
The iPhone 3G runs Apple’s iOS operating system, the same operating system used on prior iPhones, and the iPad, Apple TV, and iPod Touch. It is primarily controlled by a user’s fingertips on the multi-touch display, which is sensitive to fingertip contact.
The iPhone 3G no longer receives software updates from Apple. The last release of iOS to support the 3G was 4.2.1, which was released on November 22, 2010. iOS 4.3, released on March 11, 2011, did not support the iPhone 3G

History

On July 11, 2008, Apple released the iPhone 3G in twenty-two countries, including the original six; in 8GB and 16GB models, with the larger capacity version having the option of being in black or white. When the iPhone 3GS was released one year later, the iPhone 3G's price was cut in half, and was made the budget model of iPhone. The $99 iPhone 3G was in black only and came with 8 GB of storage. Included with this revision is iPhone OS 3.0 On June 7, 2010, the iPhone 3G was discontinued, and replaced with an 8 GB iPhone 3GS selling for the same price of $99.

Software

The iPhone 3G came preloaded with the latest version of iPhone OS both to offer the newest improvements to the software and to combat efforts of iOS jailbreaking. Over the years, the iPhone 3G has been supported by Apple with software updates. Major iterations of the software usually released yearly.
At launch, in July 2008, the iPhone 3G came preloaded with iPhone OS 2.0 which introduced the App Store, Microsoft Exchange ActiveSync support, Apple’s MobileMe service, and push email support, along with other new features and bug fixes as well.
On June 2009, the iPhone 3G received the iPhone OS 3.0 software update which introduced the long-awaited MMS feature, copy and paste, landscape support for more applications, Bluetooth stereo support, and other improvements as well.
On June 2010, the iPhone 3G owners were issued the iOS 4.0 software update. Unlike its successor, the iPhone 3GS, it did not receive multitasking, home screen wallpaper, or Bluetooth keyboard support. However, it still got the unified mailbox feature, folders, playlist creation, among other enhancements in iOS 4. Still despite the number of new features the update introduced, it was widely criticized for its slow performance on the device.
However an update to iOS 4.1 was unveiled and released on September 2010 which improved the device’s performance under iOS 4. Unlike other iOS devices though, it did not receive the Game Center application.
On November 22, 2010, the iPhone 3G received the iOS 4.2 software update, which included new features such as YouTube voting, and security fixes. The iPhone 3G however did not receive many features including AirPlay, more options in the multitasking tray, and Safari Text Search.
On January 12, 2011, the iOS 4.3 software update beta 1 was issued to developers. However, there are no iPhone 3G download links. The iPhone 3G is no longer supported by Apple in software updates.
On March 9, 2011, the iOS 4.3 software update officially announced, which was the first iOS software update leaving out the support of iPhone 3G.

Design

A rear view of the original iPhone (left) made of aluminum and plastic, and the iPhone 3G, made entirely from a hard plastic material.

The iPhone 3G's back features a redesigned plastic polycarbonate housing, replacing the aluminum back from the first generation. The buttons were also made from plastic to metal, and the edges of the phone were also tapered, providing a better grip of the phone. The iPhone 3G also introduced colors to the iPhone bringing black and white backs to the device. However only the 16GB version was available in both colors. The dimensions of the iPhone 3G were slightly larger than those of the original iPhone. It was 4.55 inches (116 mm) high, 2.44 inches (62 mm) wide, and 0.48 inches (12 mm) deep, compared to its predecessor, which was 4.5 inches (110 mm) high, 2.4 inches (61 mm) wide, and 0.46 inches (12 mm) deep.

Hardware

Screen and input

The 9cm touchscreen has a 320-by-480 (HVGA) resolution at 163 ppi, with scratch-resistant glass sitting on top of the display. The capacitive touchscreen is designed for a bare finger, or multiple fingers for multi-touch sensing.
The device also features the same sensors its predecessor had. A repositioned proximity sensor which deactivates the display and touchscreen when the device is brought near the face during a call. This is done to save battery power and to prevent inadvertent inputs from the user’s face and ears. An ambient light sensor adjusts the display brightness which in turns saves battery power. A 3-axis accelerometer senses the orientation of the phone and changes the screen accordingly, allowing the user to easily switch between portrait and landscape mode..

Processor and memory

Most of the iPhone 3G's internal hardware were based on the original iPhone. It still included a Samsung 32-bit RISC ARM11 620 MHz processor (underclocked to 412 MHz), a PowerVR MBX Lite 3D GPU, and 128 MB of eDRAM.

Camera

On the rear of the device, the iPhone 3G features the same fixed-focus 2.0 megapixel camera that its predecessor had. It had no optical zoom, flash, or autofocus, and does not support video recording, although various applications have allowed video recording on the device. The iPhone OS 2.0 software update which came preloaded on the iPhone 3G at launch, introduced the capability to embed location data in the pictures producing geocoded photographs.

Connectivity

In addition to EDGE, the iPhone 3G added Assisted GPS, 3G data, and tri-band UMTS/HSDPA. These enhancements allowed faster data downloads and turn-by-turn navigation with maps.
Like its predecessor and recent iPods, the iPhone 3G also features the same proprietary 30-pin dock connector for charging the device. It is also used to synchronize the device with a computer and to connect various accessories.
The iPhone 3G also features a flush-mounted 3.5 mm headphone jack instead of the recessed headphone jack that was included on the original iPhone, thus it can be used with headphones other than those provided by Apple.

Battery

The iPhone 3G features an internal rechargeable battery rated at 1150 mAh, which like its predecessor, is not user-replaceable. Apple states the iPhone 3G’s battery is capable of providing up six hours of web browsing on Wi-Fi, five hours on 3G and 25 hours of audio playback. It has 300 hours of standby. Unlike the first iPhone, the 3G uses a different battery which is fitted with a connector and is easier to replace. Replacement still voids the warranty if you don't use Apple's official service or third party suppliers which are authorized.
The battery life of the iPhone 3G has been criticized by several technology journalists as insufficient and less than Apple claims.

Software

Along with the iPhone 3G, the first major software update to iPhone OS 2.0 was released. It featured various new features and improvements over its predecessor, most notably the App Store.

App Store

Main article: App Store (iOS)

One of the main new features of iPhone OS 2.0 was the App Store, which allows users to install third party applications on their device. Before then, the only way to install custom applications on the device was via jailbreaking. On the App Store's initial launch, 500 applications were available for download, and this amount has grown dramatically since then. The software update was also issued to original iPhone and iPod touch users which also gave them access to the App Store although iPod touch owners were required to pay a fee to update to the new version.
A lot of other features were also given in iOS 2.0, making the iPhone 3G a full featured device at the time, having 3G data capabilities, 3rd party applications, and an updated OS that gave a lot of other software features, such as OS enhancements, extended language support, Mail/Contacts/Calendars updates, iPod (app) updates and Enterprise Support and enhancements for business users.

Issues

Hairline cracks

Since the iPhone 3G's public release, users have reported that there had been hairline cracks, especially on the white models.

Battery life

After the release of the iPhone 3G, many complaints were about battery life. This is also reflected by a J.D. Power and Associates custom satisfaction survey, which gave the “battery aspects” of the device its lowest rating of 2 out of 5 stars. That was after all of the firmwares and updates.

iOS performance issues

iOS 4, which was still compatible with the iPhone 3G, was released on June 21, 2010.
An article in the Wall Street Journal's Digits column on July 28, 2010 reported that iPhone 3G phones updating to iOS 4 responded slowly, had diminished battery life, and became excessively hot.
During a media event on September 1, 2010, Apple announced that iOS 4.1 would be released on September 8, 2010, claiming to fix issues with performance on the iPhone 3G, along with fixes for Bluetooth and proximity sensor issues and other updates.

 Source : Wikipedia