FS.31 (Baseline Security Controls)

In telecommunications, GSMA FS.31 defines a set of baseline security controls that mobile operators are expected to implement across their networks and supporting systems, aligned with NIST CSF and ISO 27001 to provide a common reference for assessments.

Categories: Protocols and StandardsOperations and Business

FS.31 in context

Telecom security is written into standards from 3GPP, GSMA, ETSI, IETF and ITU-T. Understanding which body owns which specification, and how they interlock, is essential for both design and audit work.

OSS/BSS platforms hold the highest-value subscriber and revenue data on the operator side, are heavily targeted for fraud and insider abuse, and are in scope for NIS2 and the UK Telecoms Security Act.

To place FS.31 in the wider telecom-security picture, review 3GPP, Charging System, eSIM (Embedded SIM, eUICC), IP, MAC Address and Patch — 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.