Subdivision modelling which allows either smoother edges to hard objects of for more information on a flat plain to prep it for higher fidelity modelling such as sculpting in zbrush. Edge loops are similar but are often used to define an edge so it does not become too smoothed when subdivided.
We were introduced into using floaters to get our geometry right before putting it onto the mesh. Floaters are separate bits of geometry that sit just above the mesh as to appear part of it when deselected. For the telephone we all created the dial holes then multiplied them in a circle. This is to get the angle and size right before attaching it to the mesh as this means it can be modified and it wont affect the entire mesh if it needs to be edited.
When we were satisfied with our dials we deleted the face underneath to replace it with the dial.
I experimented a little with the dial and added a central spiral in the centre using the same method.
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