IPhone OS 4 was introduced at the Apple Special Event on April 8, 2010. It is also the last version of iOS that supports the iPhone 3G and second-generation iPod Touch as its successor, iOS 5, drops support for both models. Starting with iOS 5, iPhones do not have the iPod app, but instead have the Music and Videos apps, as the iPod Touch and iPad do. IOS 4 is the final version of iOS to have the iPod app for music and videos on iPhones. 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. 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 on the iPhone was also added, although limited to newer devices due to animation performance requirements. IOS 4 introduced many features that have since become commonplace, such as 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 was the first version branded as "iOS" rather than "iPhone OS", due to the release of the iPad. It was announced at the Apple Special Event on April 8, 2010, and 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. Drops support for the first-generation iPhone and first-generation iPod Touch. 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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