The ornamental design for a wearablemodularcommunicationssystem, as shown and described.
FIG. 1 is a front view of a wearable modular communications system showing the new design; and,
FIG. 2 is a rear view thereof.
The broken lines shown in the drawings are included for the purpose of illustrating the unclaimed portions of the wearable modular communications systems and form no part of the claimed design.