Senior SIM, OTA & eSIM consulting
A senior-only specialist boutique — 20+ years across SIM/USIM/OTA platforms and applets, Brazil-based, working EN/PT. Classic-SIM depth with a foot planted firmly in the eSIM/eUICC transition. The free tools and reference on this site are living proof-of-work.
SIM & USIM Consulting — senior specialist help, end to end
The problem: SIM/USIM file provisioning, profile design, interop and field failures that in-house teams rarely have deep specialists for — and the classic-SIM knowledge base is shrinking as talent retires.
What we do
- UICC/USIM/ISIM file-system design and EF provisioning
- IMSI / ICCID / PLMN planning
- Service-table (UST/EST) configuration
- Card profile specification and review
- Interop debugging across handset and network
- Perso data preparation and QA; vendor selection / RFP support
OTA Platform Consulting — TS 102 225/226 secured provisioning, done right
The problem: OTA campaigns that fail silently, key-management and TAR/counter mistakes, SMSC↔OTA gateway integration, RAM/RFM configuration, and the migration path from classic SMS-OTA toward eSIM RSP.
What we do
- OTA security-header and key-hierarchy design (KIc/KID/KIK, SPI, PoR)
- RAM/RFM campaign design
- SMSC / OTA gateway integration
- Troubleshooting secured-packet delivery and PoR handling
- Bridging OTA to RSP as fleets go eSIM (SGP.02/22/32)
Advisory and engineering on the platform and its configuration — not key-extraction or interception work.
SIM Applet Development — Java Card / STK / CAT, spec to deployment
The problem: Value-added on-card services, steering-of-roaming, IoT applets and STK menus need scarce Java Card + GlobalPlatform + toolkit expertise.
What we do
- Java Card applet design and build
- SIM Application Toolkit / USAT proactive commands (TS 31.111 / TS 102 223)
- GlobalPlatform loading / CCM via the ISD
- Testing on programmable cards; OTA-deployable CAP packaging
Operator & eSIM Strategy Advisory — senior, independent, vendor-neutral
The problem: SIM/eSIM roadmap, vendor selection, eUICC/RSP strategy (consumer SGP.22 vs IoT SGP.32), numbering/identifier planning and technical due diligence need an independent specialist, not a vendor pitch.
What we do
- SIM→eSIM transition roadmaps
- RSP architecture selection (SM-DP+ / eIM)
- Vendor / RFP evaluation
- Identifier and numbering strategy
- Technical due diligence; interim / fractional technical lead
How we work
Short diagnostic → fixed-scope package or day rate. Remote-first, EN/PT. Consulting is invoiced directly (wire / Wise), outside any checkout. Put a real problem in front of a real specialist.