I know this is easy to do in C4D (you did mention other 3D apps). Create a helix spline and a circle spline (setting the circle to the desired radius for your phone lead), then drop them both into a sweep nurbs object. Make sure the circle is above the helix. Thats it! Sorry I cant give any advice for Carrara, my demo has expired:( Michael;)

I never intended to make art.