Originally, i Pod Touch users had to pay for system software updates.
It is the second most popular mobile operating system globally after Android.
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.
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".