FIG. 1 is a perspective view of the ornamental design for the security network handset shape;

FIG. 2 is a front view of the ornamental design for the security network handset shape;

FIG. 3 is a rear view of the ornamental design for the security network handset shape;

FIG. 4 is a left side view of the ornamental design for the security network handset shape;

FIG. 5 is a right side view of the ornamental design for the security network handset shape;

FIG. 6 is a top view of the ornamental design for the security network handset shape; and,

FIG. 7 is a bottom view of the ornamental design for the security network handset shape.

The broken line showing of environmental structures is for illustrative purposes only and forms no part of the claimed design.