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.
Interface control elements consist of sliders, switches, and buttons.
Interaction with the OS includes gestures such as swipe, tap, pinch, and reverse pinch, all of which have specific definitions within the context of the i OS operating system and its multi-touch interface.
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.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.However, it can also be accessed as it was in i OS 3 – 6.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.It is available for all i OS devices with 64-bit processors; the i Phone 5S and later i Phone models, the i Pad (2017), the i Pad Air and later i Pad Air models, all i Pad Pro models, the i Pad Mini 2 and later i Pad Mini models, and the sixth-generation i Pod Touch.In 2005, when Steve Jobs began planning the i Phone, he had a choice to either "shrink the Mac, which would be an epic feat of engineering, or enlarge the i Pod".Internal accelerometers are used by some applications to respond to shaking the device (one common result is the undo command) or rotating it in three dimensions (one common result is switching between portrait and landscape mode).Apple has been significantly praised for incorporating thorough accessibility functions into i OS, enabling users with vision and hearing disabilities to properly use its products. The current version, i OS 11, was released on September 19, 2017.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.