FIG. 1 is a front isometric view of an ornamental design for a communication device showing our new design;

FIG. 2 is a front orthographic view thereof;

FIG. 3 is a rear orthographic view thereof;

FIG. 4 is a right side orthographic view thereof;

FIG. 5 is a left side orthographic view thereof;

FIG. 6 is a top orthographic view thereof; and,

FIG. 7 is a bottom orthographic view thereof.

The broken lines shown in FIGS. 1-7 are included for the purpose of illustrating environmental elements only and form no part of the claimed design.