Apple Senior vice-president of Worldwide Marketing, Phil Schiller, introduces the iPhone X during a launch event in Cupertino, California, US, Sept 12, 2017. [Photo/Agencies]

The wireless charging uses a standard called Qi, also used by Samsung, and will work with third-party devices.

The new phones all feature Apple's first proprietary graphics processor, which provides greater speed, improved cameras and some features for augmented reality apps.

The company had previously used graphics chips from Imagination Technologies Group PLC, which put itself up for sale earlier this year after Apple said it would make its own technology.

Apple is moving to design more of the internal components of the iPhone, squeezing some suppliers but giving Apple control of key technologies.