However, the company became the subject of a lawsuit from an unsatisfied customer over the issues. The iOS 4 update introduced performance and battery problems on iPhone 3G devices, with Apple investigating the matter and promising then-upcoming updates. 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 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. Support for custom wallpapers was also added, although limited to newer devices due to animation performance requirements.
IOS 4 introduced folders on the home screen, significantly increasing the number of apps that can be displayed.
It was succeeded by iOS 5 on October 12, 2011. iOS 4 is the first iOS version issued under the "iOS" rebranding, dropping the "iPhone OS" naming convention of previous versions. It was announced at the Apple Special Event on April 8, 2010, and was released on June 21, 2010. IOS 4 is the fourth major release of the iOS mobile operating system developed by Apple Inc., being the successor to iPhone OS 3.
Obsolete, extremely limited third party app support Proprietary EULA except for open-source componentsĪpple – iPhone – New features in the iOS 4 Software Update at the Wayback Machine (archived June 30, 2010)
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