FIG. 1 is a perspective view of an ornamental design of a first embodiment of a communication device.

FIG. 2 is a left side view of the first embodiment thereof.

FIG. 3 is a front view of the first embodiment thereof.

FIG. 4 is a bottom view of the first embodiment thereof.

FIG. 5 is a top view of the first embodiment thereof.

FIG. 6 is a right side view of the first embodiment thereof.

FIG. 7 is a back view of the first embodiment thereof.

FIG. 8 is a perspective view of an ornamental design of a second embodiment of a communication device.

FIG. 9 is a left side view of the second embodiment thereof.

FIG. 10 is a front view of the second embodiment thereof.

FIG. 11 is a bottom view of the second embodiment thereof.

FIG. 12 is a top view of the second embodiment thereof.

FIG. 13 is a right side view of the second embodiment thereof.

FIG. 14 is a back view of the second embodiment thereof.

FIG. 15 is a perspective back view of an ornamental design of a third embodiment of a communication device, which differs from the second embodiment in that the battery compartment projects further outward from the back of the device, includes an additional cover proximate the back speaker grill, and includes a window proximate the top of the device.

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