Redesigned headphones, a 4in screen, and credit card-like capabilities are just a few of the features reportedly boasted by Apple’s latest version of the iPhone, expected to be unveiled today.

Foxconn Technology Group, the top maker of Apple iPhones and iPads whose factories are under scrutiny over labour practices, has raised the wages of its Chinese workers by 16%-25%, the third pay rise since 2010.

An independent group has begun inspecting the Chinese factories where Apple's iPads and iPhones are assembled, amid growing criticism over claims of horrendous working conditions.

Apple is facing demonstrations at some of its retail stores around the world.

Apple chief executive Steve Jobs has said he finds a string of suicides at a factory that makes key components for his company's products in China "troubling".