Photographs of what is claimed to be a back panel belonging to Apple's rumoured low-cost iPhone have surfaced online, showing a device with a curved design and a Lighting port.Related StoriesiPhone owners spend 75 minutes a day on iPhone, Android users lag behindApple iPod touch sales reach 100 millioniPhone 6 rumours: 4in-plus 'super Retina' screen, gaze detection, iOS 7
