📡 Cellular PositioningUpdated: September 2, 2026
SIM Card OTA Architecture: Remote USIM Applet Updates, eSIM Profiles & Clone Detection
By Mobile Telecommunications & Network Security Review Board
How Universal Integrated Circuit Cards (UICC) work: Over-the-Air (OTA) SMS-PP commands, Java Card applet execution, eSIM GSMA RSP specifications, and SIM-swap detection.
Subscriber Identity Module (SIM/USIM) smart cards contain tamper-resistant cryptographic microcontrollers running secure Java Card applets.
1. SIM Card Technologies
- Over-The-Air (OTA) Management: Operators use encrypted Point-to-Point SMS (SMS-PP) commands to update Preferred Roaming Lists (PRL) and authentication keys remotely.
- eSIM Remote SIM Provisioning (RSP): GSMA SGP.22 architecture enables secure digital profile downloads to embedded eUICC chips via TLS mutual authentication.
- SIM-Swap Fraud Countermeasures: Mobile carriers track IMSI-to-ICCID binding timestamps to alert financial institutions when a subscriber's physical SIM has been recently re-issued.
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