Redpark cable

I'm using a redpark cable to connect an Arduino pro mini to an i-phone but I can't. Anyone who has any experience to help ?
Note that my code works perfectly with an Arduino uno.

Got a link to "redpark cable"?

Note that my code works perfectly with an Arduino uno.

But, does the cable? If so, then you haven’t connected it the same way to the mini.

CrossRoads:
Got a link to "redpark cable"?

@OP

There are two version of the Pro Mini. One runs at 3.3V and 8 MHz, the other at 5V and 16 MHz.

http://forum.arduino.cc/index.php?topic=169544.msg1261837#msg1261837

if you have 3.3V version Pro Mini. You need skip Step 4 to make your own cable.