The home screen appears whenever the user unlocks the device or presses the physical "Home" button whilst in another app.Before i OS 4 on the i Phone 3GS (or later), the screen's background could be customized only through jailbreaking, but can now be changed out-of-the-box.This feature is only available on third-generation devices—i Phone 3GS, third-generation i Pod touch (i OS 4.0 or newer), all i Pad models (since i OS 3.2)—or newer.Researchers found that users organize icons on their homescreens based on usage-frequency and relatedness of the applications, as well as for reasons of usability and aesthetics. Apple switched to Helvetica Neue exclusively for the i Phone 4 and its Retina Display, and retained Helvetica as the system font for older i Phone devices on i OS 4.When a passcode is set and a user switches on the device, the passcode must be entered at the Lock Screen before access to the Home screen is granted.In i Phone OS 3, Spotlight was introduced, allowing users to search media, apps, emails, contacts, messages, reminders, calendar events, and similar content.In i OS 7 and later, Spotlight is accessed by pulling down anywhere on the home screen (except for the top and bottom edges that open Notification Center and Control Center). As with i OS 7 and 8, pulling down on any homescreen will show Spotlight.
As of January 2017, Apple's App Store contains more than 2.2 million i OS applications, 1 million of which are native for i Pads.
Originally, i Pod Touch users had to pay for system software updates.
This was due to accounting rules making the device not a "subscription device" like i Phone or Apple TV, and significant enhancements to the device required payments.
This gives a Spotlight endowed with Siri suggestions, which include app suggestions, contact suggestions and news.
Since i OS 3.2, users are able to set a background image for the Home screen.