IOS 4
| A version of the iOS operating system | |
 |
|
iOS 4 running on an iPhone 4.
|
|
| Developer | Apple Inc. |
|---|---|
| Source model | Closed, with open source components |
| Initial release | June 21, 2010 |
| Latest release |
4.2.1 (November 22, 2010)
4.2.10 (July 25, 2011)
|
| Platforms |
iPhone 3G iPhone 3GS iPhone 4 iPod touch (2nd generation) iPod touch (3rd generation) iPod touch (4th generation) iPad (1st generation) iPad 2 |
| Kernel type | Hybrid (XNU) |
| License | Proprietary EULA except for open-source components |
| Preceded by | iPhone OS 3 |
| Succeeded by | iOS 5 |
| Official website | iOS 4 at the Wayback Machine (archived June 30, 2010) |
| Support status | |
| Unsupported as of about 2013 | |
4.2.1 (November 22, 2010)
4.2.10 (July 25, 2011)
iOS 4 is the fourth major release of the iOS mobile operating system designed by Apple Inc., being the successor to iPhone OS 3. It was released on June 21, 2010, and was the first major release to be renamed to simply "iOS", and the first major release to drop support for some devices, as well as the first update that iPod Touch users did not have to pay for. iOS 4 was succeeded by iOS 5, which was released on October 12, 2011.
iOS 4 was introduced during the annual Apple Worldwide Developers Conference on June 7, 2010 together with the iPhone 4. With the release of the first-generation iPad earlier that year, the company renamed iPhone OS to iOS to reflect the entire family of devices. iOS 4.0 supported only the iPhone and iPod touch at launch, but later added iPad support. It also added over 1500 new APIs for developers, including the highly anticipated multitasking feature.
iOS 4.0.1 was released on July 15, 2010, as the first update to iOS 4. The update has an updated carrier signal strength display, along with other bug fixes.
iOS 4.0.2 was released on August 11, 2010, with a fix for an PDF exploit that allowed jailbreaking on Safari.
iOS 4.1 was released on September 8, 2010. The update included a technology known as HDR for better photos and to better the quality. It also introduced Game Center, along with high definition videos, where it can be shared on YouTube or MobileMe. It was the first version of iOS available on the Apple TV (2nd generation).
iOS 4.2.1 was released on November 22, 2010. It was the first version to bring major feature parity to the iPhone and iPad. It was also the last to support the iPhone 3G and iPod Touch (2nd generation, MB & MC models).
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