No actually it works with iPhone 4 if you're jailbroken. If you're crafty you can buy one of the smaller "cabled" CCKs, reterminate the standard USB with a mini usb, and use it with a compatible amp/dac. I did this with a d-zero & e07k and in the end the footprint was a wash with your average LOD, if not smaller.
Here's a pic of my CCK hiking setup that I never finished, it works but still a little hot glue and black nail polish from being complete.
Edited by ChavaC - 7/15/13 at 1:14am