1G (First Generation Mobile Network)

The original analog cellular network technology deployed in the 1980s. 1G systems like AMPS (Advanced Mobile Phone System) used analog radio signals for voice calls but offered no data capability, limited encryption implementation, and coverage constraints compared to modern networks.

Categories: Radio Access NetworkSignalingSecurity Controls

1G in context

The radio access network is where mobile devices attach to the operator's infrastructure. Attacks in this layer include IMSI catching, rogue base stations and downgrade attacks; defenses rest on mutual authentication, integrity-protected signaling and Open RAN supply-chain hygiene.

Signaling protocols carry the control-plane messages that set up calls, register subscribers and route SMS. SS7, Diameter, GTP-C and SIP are the four dominant families, and interconnect exposure of any of them is treated by GSMA as top-tier telecom risk.

To place 1G in the wider telecom-security picture, review ITU, Lawful Interception, RADIUS, RTP, SIP and TCP — each entry cross-references back to this page so you can walk the topic in either direction.

Related terms

More from the TelcoSec Glossary

Browse the full TelcoSec Glossary, the Ultimate Guide to Mobile Network Security, or the P1 Arsenal of telecom-security tools.