After seeing those wrist phone commercials(Imagine that,science fiction comes to life on that one,what next?lol.)and seeing that
scene from ST TMP where Kirk and crew use those particular communicators,I just realized that we never saw those again in the rest of the movies,and they just used regular communicators.
Did that TMP communicator not catch on or something? Just really wanted to know.
Personally,between those writst ones and TNG comm badges,I always preferred the hand held ones anyways.