With IPhone 4 do I need to buy anything to use Nike+ app

I don't understand. The app is already built in but I can't activate the sensor. I already turned the thing on but ive walked around a lot without any result. Is there something additional I need to buy?

  • Asked by Jasmine S from Upper Marlboro
  • Jun 13, 2012
Nike + iPod Sensor

Nike + iPod Sensor

Product No Longer Available

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