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
www.isaac.cs.berkeley.edu/isaac/gsm.html

Nick Vs Networking on modern SIM card Authentication
nickvsnetworking.com/confidentiality-algorithms-in…

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