This is a dock that accepts a USB sync cable and mounts to the wall (or whatever). I've only tested the fit with the cable that I have on hand which may not be a genuine apple cable. There is a bit of a taper in the spot for the connector so that it sticks in there a bit and hopefully won't pull out when you remove the phone.This should fit an iphone 3g or 3gsPrint it, slide the USB connector through the hole in the bottom and pull the cable through. Make sure the dock connector is facing the right way.Hang it!Make sure that the screw you use to mount it is countersunk enough that it doesn't scratch your phone.