Notes

Read this, then the spec.

Informal, but the concepts are the ones that show up in production. Some notes are interactive — you choose an answer and the story continues. Start with how a SIM works.

• How a SIM actually works

  Hide a key. Prove you have it. Then Java Card, applets, and the electrical profile.

• What does a police interrogation have to do with a SIM card that goes silent?

  Interactive note — pick A or B; the story continues. Why a silent card after OTA can be correct.

• A SIMbox can fake the IMEI. The Terminal Profile still talks.

  Fingerprint the modem from Terminal Profile — then discuss the opportunity.