The cables are shielded so this should help with Cell phone interference but since they are not balanced this goes against longer cable runs.
BTW - You can order a KS cable of any length from Schoeps directly it's just a custom order.
For a non-Schoeps cable, the binder ends are about $10 (from binder-usa.com) a piece and the cable is about $1-$2 (from markertek.com, or full compass) per foot if you wanted to make it yourself.