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This is a list of articles which pertain to telecommunications on 24.
“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
“OPCOM was a secret CIA backchannel communications link, believed to have been inactive for...OPCOM
“ECHELON was an NSA government system to monitor messages transmitted via phone or the internet...ECHELON