New-generation Apple software for powering its coveted mobile devices is set for release on Wednesday, two days ahead of the arrival of its latest iPhones.
The iOS 8 mobile operating system will be available free for download to many iPhone and iPad models and will be pre-installed on iPhone 6 and iPhone 6 Plus, which hit the market on Friday.
Apple unveiled iOS 8 at its annual developers conference in San Francisco in June.
The new operating software is tailored to deliver a seamless experience for users flitting between Apple mobile gadgets and popular Macintosh computers.
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Alongside operating system updates, the California company unveiled HealthKit software to manage personal healthcare and HomeKit for home appliances. They are integrated into the latest system update.
HealthKit will provide a secure haven for data collected by devices such as fitness bands that track activity and sleep.