Top 8 full upgrades that iPhone 4 have compared with iPhone 3

iPhone 4 has been upgraded in the following top 8 aspects, and it has a lot of improvement compared with iPhone 3. Apple iPhone 4 has two colors, namely black and white, and the price of 16GB and 32GB are 199 USD and 299 USD respectively.

Thickness
The thickness is reduced by 24%, with only 9.9mm. Apple proclaims that iPhone 4 is the thinnest smart phone in the world.

Screen
iPhone has High-resolution screen, with screen increasing to 3.5-inch screen, 960 * 640 pixels compared with iPhone, iPhone 3G and iPhone 3GS. The screen uses the Retina display technology.

Camera
iPhone 4 installs the front video call camera, with the main camera increasing to 500 million pixels. It adds flash light for the first time and it supports 720P high definition
video playback. In addition, Apple adds Facetime video chat capabilities to iPhone 4.

1GHz processor
iPhone 4, like iPad, uses Apple iPad A4 processor, with 1GHz. There are 16GB and 32Gb versions about storage.

New details
iPhone 4 uses a dual microphone design for the first time , contributing to noise reduction. In addition, the fixed frame around the body is deigned with iPhone 4 antenna, Bluetooth, with Wi-Fi and GPS, is on the left. WCDMA and GSM are on the right.

Gyro
iPhone 4 adds a new three-axis gyro sensor to retain the orientation sensor, proximity sensor and light sensor for the first time.

Facetime
Apple adds free video chat function to iPhone that is based on Wi-Fi, and it is the first application in iPhone series.

iOS
Apple has renamed iPhone OS 4 as iOS 4. The iPhone operating system in this version supports API-based multi-task. There is iBook function in the iOS, so that you can view pdf files and epub books, as well as adding tags to iBooks.

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