Gsma Fs.38 [best] Jun 2026

Your IoT device’s firmware (C, Rust, MicroPython) needs a driver to send APDUs to the SIM. A minimal sequence:

Because it uses the existing SIM, it’s actually more cost-effective for small deployments where buying a dedicated HSM is prohibitive. gsma fs.38

Securing the connection between the user equipment (like a smartphone or IoT device) and the network. Your IoT device’s firmware (C, Rust, MicroPython) needs

The (typically FS.38 V2.0 or later) is available to GSMA members via the GSMA website. Non-members may find public summaries, but the full spec requires membership or purchase from the GSMA Document Store. The (typically FS

Dedicated secure chips (like ATECC608 or Trusted Platform Modules) are expensive and add Bill of Materials (BOM) cost.

Keywords used: GSMA FS.38, IoT SAFE applet, SIM-based authentication, ECC P-256, secure element, cellular IoT security, APDU commands, eSIM crypto.

The GSMA document , also known as the SIP Security Permanent Reference Document (PRD)