eSIM
ApplicationEmbedded SIM -- a programmable SIM chip soldered onto a device, allowing remote provisioning of mobile network profiles.
eSIM
An eSIMeSIMApplicationProgrammable embedded SIMSIMApplicationSmart card for mobile network authentication.Click to view → chip.Click to view → (embedded SIM), technically an eUICC (embedded Universal Integrated Circuit Card), is a reprogrammable SIM chip that is soldered directly onto a device's circuit board rather than inserted as a removable card. The eSIM can securely download, store, and switch between multiple mobile network operator profiles without physical SIM swapping, enabling remote provisioning over the internet or cellular network.
eSIM Architecture
The eSIM platform consists of on-device and network-side components working together:
| Component | Location | Function |
|---|---|---|
| eUICC | Device (soldered chip) | Secure ElementSecure ElementSecurityTamper-resistant hardware for secure operations.Click to view → storing operator profiles |
| LPA | Device (software) | User interface for profile management |
| SM-DP+ | Network (server) | Prepares and delivers encrypted profiles |
| SM-DS | Network (server) | Discovery service helping LPALPAProvisioningDevice-side app for managing eSIM profile operations.Click to view → find pending profiles |
The eUICCeUICCProvisioningReprogrammable SIM chip supporting remote profile switching.Click to view → chip is a Secure Element containing an ISD-R (Issuer Security Domain - Root) that manages the profile lifecycle. Each operator profile is a complete virtual SIM containing IMSI, Ki, OPc, file system, and network access applications — equivalent to the contents of a physical SIM card.
Consumer vs M2M Provisioning
The GSMA defines two RSPRSPApplicationOver-the-air SIM profile management.Click to view → (Remote SIM Provisioning) architectures:
| Aspect | Consumer (SGP.22) | M2M (SGP.02) |
|---|---|---|
| Profile delivery | Pull (user-initiated via LPA) | Push (operator-initiated via SM-SR) |
| User interface | Required (QR code, app) | Not required (headless devices) |
| Target devices | Smartphones, tablets, watches | IoT sensors, vehicles, meters |
| Profile switching | User-controlled | Operator-controlled |
eSIM vs Physical SIM
| Feature | Physical SIM | eSIM |
|---|---|---|
| Form factor | Removable (mini/micro/nano) | Soldered (MFF2 or wafer-level) |
| Operator switching | Swap card | Download new profile OTAOTAPersonalizationRemote card management via mobile network.Click to view → |
| Multi-profile | One active | Multiple stored, one active per subscription |
| Logistics | Manufacture, ship, distribute | Instant remote provisioning |
| Device design | SIM tray required | No tray — saves 1-2 mm thickness |
| Security | Physical access risk | Secure Element protection + remote lock |
Standards and Certification
eSIM technology is governed by GSMA specifications (SGP.21, SGP.22, SGP.32) and ETSI standards (TS 102 221, TS 131 102). eUICC chips require Common Criteria certification (typically EAL 4+ or 5+) and manufacturers must obtain GSMA SAS accreditation. The SM-DP+ platform is certified under GSMA SASGSMA SASComplianceGSMA security certification for SIM/eSIM manufacturers.Click to view →-SM (Subscription Management) security requirements.
iSIM: The Next Step
iSIM (Integrated SIM) takes the eSIM concept further by embedding SIM functionality directly into the device's system-on-chip (SoC), eliminating the need for a separate eSIM chip entirely. This reduces cost and size for massive IoT deployments while maintaining Secure Element grade security through a hardware-isolated partition in the SoC.
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The smart card glossary is a comprehensive reference of technical terms, acronyms, and concepts used in smart card technology. It covers protocols (APDU, T=0, T=1), security (Common Criteria, EAL, HSM), hardware (SE, EEPROM, contact pad), and applications (EMV, ePassport, eSIM). It serves developers, product managers, and engineers.
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