Telecom Basics (Part 2): Cell ID, ILD, and Call Detail Records
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This lesson builds on telecom basics. You will learn what a Cell ID is and how it supports location work, how international roaming and long-distance calls operate, and how to read and analyse a Call Detail Record.
Focus: understand Cell IDs, roaming/ILD, and CDRs well enough to see how they support an investigation — lawfully.
Learning objectives
- Explain what a Cell ID is and how it helps estimate a device's location.
- Describe international roaming and International Long-Distance (ILD), and why they matter to investigators.
- List the main parts of a Call Detail Record (CDR).
- Describe how CDRs are analysed, and the legal limits on their use.
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