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Whether you use i Tunes or update wirelessly, you'll have the same amount of free space on your device after you update.
If you can’t update wirelessly on your i OS device, you can update manually using i Tunes on a computer that you trust.
Around the same time, the release of i Phone 4 and its subsequent antenna problems made Apple focus on unsuccessfully attempting to patch the issues with software updates.
i OS 4 was introduced at the Apple Worldwide Developers Conference keynote address on June 7, 2010.
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.
The update includes multiple bug fixes and security enhancements and is therefore recommended that users install the system software update.i OS 4 is the first i OS version issued under the "i OS" rebranding, dropping the "i Phone OS" naming convention of previous versions. i OS 4 introduced folders on the home screen, significantly increasing the number of apps that can be displayed.Support for custom wallpapers was also added, although limited to newer devices due to animation performance requirements.Separately, Apple also released software updates to Mac OS 10.12.3, tv OS 10.1.1, and watch OS 3.1.3.Be sure to backup your i Phone, i Pad, or i Pod touch before beginning any software update with i OS.
Users can also choose to update their i Phone and i Pad with i Tunes and a computer.