The iPhone 4 was officially released on June 24, 2010.
The iPhone 4 was a significant upgrade from its predecessor, featuring a new design with a stainless steel frame and a glass front and back.
The iPhone 4 was available in two models: a 16GB model and a 32GB model.
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iPhone 4 Release Date
The iPhone 4 release date was June 24, 2010. This is a significant date in the history of Apple's iconic smartphone.
Apple CEO Steve Jobs introduced the iPhone 4 at the company's Worldwide Developers Conference a few weeks earlier on June 7, 2010. He joked about the fact an iPhone 4 prototype had already been torn down and published online.
The iPhone 4 was the final iPhone released during Jobs' life. It was also the last one to debut at a WWDC.
New Features and Design
The iPhone 4 brought a significant leap in display technology, boasting a Retina display with a resolution of 960x640 pixels and a density of 326ppi, making images look like they were painted just beneath the glass.
This was made possible by doubling the resolution both horizontally and vertically, while keeping the physical size constant at 3.5-inches.
The iPhone 4 also saw an increase in RAM to 512MB, although it was still barely enough to support the additional pixels.
A 1420mAh battery was introduced, which actually managed to increase useful battery life despite the Retina display.
The iPhone 4 added a 3-axis gyroscope, providing 6-axis motion detection, a huge leap forward in precision control, especially for gaming.
A 5 megapixel rear camera was also introduced, along with a backside illuminated sensor and LED flash.
Pre-Order and Availability
The new device is set to be released on March 15th.
Pre-orders for the device started on February 22nd, and customers can reserve their unit on the company's official website or at authorized retailers.
The limited edition model will be available exclusively on the company's website, and only 1,000 units will be produced.
The device will be available in three different colors: Midnight Blue, Sunset Orange, and Arctic White.
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Increased Pixel Density
The iPhone 4's display was a major upgrade, boasting 4 times the pixels of its predecessor. It was a game-changer for image quality.
The resolution was doubled both horizontally and vertically, taking it from 480x320 to 960x640 pixels. This significant boost in resolution helped the pixels disappear at normal viewing distance.
Apple's decision to keep the physical size constant at 3.5-inches was a clever move, as it maintained compatibility with existing apps. The result was a Retina display with a density of 326ppi.
This increased pixel density made images look like they were painted just beneath the glass, and greatly improved viewing angles.
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