This is a list of articles which pertain to telecommunications on 24.
“OPCOM was a secret CIA backchannel communications link, believed to have been inactive for...OPCOM
“A subchannel chip was a piece of telecommunications technology designed to receive a specific...Subchannel chip
“SIM cards—technology found in cellular phones—served to provide critical leads during the CTU...SIM card
“ECHELON was an NSA government system to monitor messages transmitted via phone or the internet...ECHELON
“PCD Telecom, LLC was a telecommunications corporation. PCD Telecom operated a payphone in Block...PCD Telecom, LLC