Builds on: Telecom Basics (Part 1): Networks, Calls, and Cell Towers
Subscriber Identity: SIM, eSIM, IMEI and Number Portability
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A phone number is not a person. Between the number and the person stand a subscription, a SIM, a handset and a name on a form. Each has its own identifier, and each can change hands. This unit shows what each identifier proves, and where the chain is weak.
Focus: four identifiers, and one rule: a subscriber record is a lead, not proof. This unit is not legal advice.
Learning objectives
- Tell apart the number, the subscription, the SIM and the handset.
- Explain what an eSIM changes for an investigator.
- Say why a handset number or a subscriber name can mislead.
- Find the right operator for a number that has been ported.
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