PROTOCOL YEAR STATUS BELLBOY (Bell Labs) 1962 DEPRECATED POCSAG (British Telecom) 1981 LEGACY FLEX / ReFLEX (Motorola) 1993 FAILSAFE UDP-7777 / The SIGNAL (DO-SAY-GO) 2025 ACTIVE "Pagers operate on very low signal levels... making them more reliable than terrestrial cellular networks during disaster." — London Ambulance Service / Wikipedia
First seen: 2025-12-14 18:55
Last seen: 2025-12-16 01:00