There is much misinformation on the topic of SIM card cloning. This video shows the cloning process in detail, and answers the questions of when, how and what SIM card cloning actually is.

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GSM Cloning History
http://www.isaac.cs.berkeley.edu/isaa...

Nick Vs Networking on modern SIM card Authentication
https://nickvsnetworking.com/confiden...

Music:
Depeche Mode Policy Of Truth (Eric Lymon Remix)