iPhone users still want the Nike+ Sport Kit to work with their phones. The current status now reads, sadly “This accessory is not supported by iPhone” The phone’s flash-based, relatively small and light (if you use an armband) should work perfectly with the kit. If enough people get behind this idea, there could even be a bounty set up to reward the hacker(s) that enable this. Could you access the 30-pin accessory port with the iPhone? Is this a pipe dream, or could this possibly be done?”]
Source: https://gizmodo.com/iphone-hacker-challenge-make-the-iphone-work-with-nike-300337