FIG. 1 is a front perspective view of an ornamental design for a communication device;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a first side view thereof;

FIG. 6 is a second side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines shown throughout the views that are immediately adjacent to the shaded areas and define unshaded regions, represent the bounds of the claimed design, except for the broken lines at the bottom rear which are superimposed on a continuous surface. All other broken lines are directed to environment and are for illustrative purposes only. The broken lines form no part of the claimed design.