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iOS 4 facts for kids
| iOS 4 | |
|---|---|
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|
 |
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| iOS 4 home screen | |
| Developer | |
| Apple Inc. | |
| Source model | Closed, with open source components |
| License | Proprietary EULA except for open-source components |
| Kernel type | Hybrid (XNU) |
| Platform support | |
| Preceded by | iPhone OS 3 |
| Succeeded by | iOS 5 |
| Support status | |
| Obsolete, limited third party app support | |
iOS 4 is the fourth major release of the iOS mobile operating system developed by Apple Inc. that replaced iPhone OS 3. It was announced at the Apple Special Event on April 8, 2010, and was released on June 21, 2010. iOS 4 is the first iOS version issued under the "iOS" rebranding, dropping the "iPhone OS" naming convention of previous versions. It was succeeded by iOS 5 on October 12, 2011.
iOS 4 features were:
- folders on the home screen,
- increased number
- support for custom wallpapers.
The operating system also added a multitasking feature, letting apps dealing with Internet calling, location and audio playback function in the background, whereas a similar but more restricted "Fast App Switching" technology enabled any app to be left inactive in the background while users switch to other apps. iOS 4 also added a system-wide spell checking feature, enabled iBooks on iPhone, unified the Mail inbox to combine content from different email providers, and introduced both Game Center for social gaming and FaceTime for video calling.
The iOS 4 update introduced performance and battery problems on iPhone 3G devices, with Apple investigating the matter and promising then-upcoming updates. However, the company became the subject of a lawsuit from a unsatisfied customer over the issues. Around the same time, the release of iPhone 4 and its subsequent antenna problems made Apple focus on unsuccessfully attempting to patch the issues with software updates.
iOS 4.0 only supported the iPhone and iPod Touch. iOS 4.0 was said to have more than 1500 new APIs for app creators. It also supported the multitasking feature for the first time. The final iOS version for the 2nd generation iPod Touch, and iPhone 3G is iOS 4.2.1. iOS 4.2.1 was the first version to make iPhones and iPads use the same operating system.
This is also the final iOS operating system to have, on iPhones, an iPod app for music and videos; starting with iOS 5, iPhones have the same separate Music and Videos apps as do iPod Touch and iPad models.
Version history: Apple TV (2nd generation) onwards
iOS 4.1 was the first version of iOS for the Apple TV 2. It also had Apple TV Software 4.0.