SS7, a mobile protocol that can be hacked to track users or intercept calls, remains flawed after decades due to the FCC's reliance on telecom industry advice (Andrea Peterson/Ars Technica)

Andrea Peterson / Ars Technica:
SS7, a mobile protocol that can be hacked to track users or intercept calls, remains flawed after decades due to the FCC's reliance on telecom industry advice  —  The regulatory back door big telecom uses to weaken security regulation. … The outages hit in the summer of 1991.