This is a list of articles which pertain to telecommunications on 24.
“SIM cards—technology found in cellular phones—served to provide critical leads during the CTU...SIM card
“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
“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