Apple's latest mobile operating system iOS 8 will become available on iPhone 4s and above from 17 September.
An iPhone will be required to use the Apple Watch, the tech company says.
The smartwatch will come with a Siri digital assistant and will feature a "taptic engine" to notify users of incoming messages with a tap on the wrist.
Details of Apple's new smartwatch have been revealed - with the new device coming in three "collections": Apple Watch, Apple Watch Sport and Apple Watch Gold Edition.
It will also be scratch-resistant and have a number of interchangable straps.
Sapphire incorporated into the Apple Watch. Second hardest material -- only thing that can scratch it is diamond. #AppleLive
six different interchangeable straps for Apple Watch, including sweat-resistant "sport band" and soft leather band.
The first pictures of the new Apple Watch have been released by the company.
Apple's new smartwatch will be called Apple Watch and will be customisable, in various different colours, the company's CEO Tim Cook has said.
Tim Cook on new Apple watch: It’s synchronized with the universal time standard and it’s accurate within plus or minus 50 milliseconds
Tim Cook: What we didn’t do is take the iphone and shrink the user interface and strap it on your wrist
Apple has unveiled a new smartwatch after CEO Tim Cook announced there would be "one more thing" at the company's "special event" in California.
Apple has announced the launch of a new payments service, Apple Pay, which will come with every new iPhone.
It is initially being launched in the United States and will work with American Express, MasterCard, and Visa payment networks.
The US pricing for the new iPhone 6 and iPhone 6 Plus has been announced by Apple.
All prices apply to phones bought with a two-year contract.
- 16GB: $199
- 64GB: $299
- 128GB: $399
iPhone 6 Plus
- 16GB: $299
- 64GB: $399
- 128GB: $499
The iPhone 6 and iPhone 6 Plus will begin shipping from 19 September, with pre-orders available from Friday (12 September).
Apple has released further specifications and details on the cameras for the new iPhone 6 and iPhone 6 Plus.
Apple now describing new 8 megapixel cameras on the iPhone 6 models.
You can take bigger panoramas with the iPhone 6 Plus + more. iPhone may soon be a viable alternative to the DSLR. #applelive
New iphone cameras have advanced face detection and advanced blink and smile detection.