Don't forget the handheld communicators powerful enough for someone at the NZ to have a conversation with someone on Earth. In REAL TIME.
I don't understand this bit. Why would a hand communicator be a less likely way to talk from star to star than a starship communicator? Both are likely to simply hook up to an existing network anyway. It's not as if the hand communicator would have been operated far away from all possible boosters, now is it?