You can make and answer phone calls on your iPhone while using Nike + iPod.
If your phone rings, press the Sleep/Wake button to silence the ringer. To send the call directly to voicemail, tap "Decline" or hold the mic button for approximately two seconds.
If you answer the call, your Nike + iPod run will pause during the call. When the call ends, press "Play" to continue the run.
When you make a call during a run, your workout will pause. When the call ends, touch the red bar at the top of the screen to return to your Nike + iPod run and then press "Play" to continue.