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Here is the fourth part.
Step 1
Split line and project them on back face.
Step 2
Inner face >> Sketch.
Step 3
Convert the inner edge and extrude cut it by 0.50mm.
Step 4
Dome it by 0.4mm.
Step 5
Circular face >> Sketch.
Step 6
Convert the edge.
Step 7
Extrude it by .10mm and uncheck Merge result.
Step 8
Bottom face >> Sketch.
Step 9
Draw a slot.
Step 10
Mirror it about a center line on origin.
Step 11
Extrude cut by 1mm.
Step 12
Left face >> Sketch.
Step 13
Draw this slot.
Step 14
Split line and then select inner face.
Step 15
Bottom face >> Sketch.
Step 16
Draw a rectangle.
Step 17
Extrude cut by 2.5mm.
Step 18
Chamfer the cut edge by 0.15mm at 45º.
Step 19
Bottom face >> Sketch.
Step 20
Draw two circles.
Step 21
Split line and select bottom face.
Step 22
Circular face >> Sketch.
Step 23
Draw a 5 side polygon and construct star.
Step 24
Repeat same step for other circular face. Make polygon construction.
Step 25
Extrude cut by 0.50mm.
Step 26
Here is fifth part.
http://grabcad.com/questions/tutorial-making-iphone-4s-in-solidworks-part-5