Expert Answer:
s:
Another choice is to set the edgeColor and/or lineStyle properties of the surface handle object to none.
>> hSurf = surf(X,Y,Z,'EdgeColor','none','LineStyle','none','FaceLighting','phong');
This is a more general solution, you can change the edgeColor after the surface has been created too. It does not rely on LineStyle and FaceLighting.