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“SIM Card Number.” Verizon Wireless USB551L 4G USB Modem, www.verizonwireless.com/support/knowledge-base-38004/.&#13;
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Condliffe, Jamie. “The World's Biggest SIM Manufacturer Denies Major Encryption Key Hack.” Gizmodo, Gizmodo.com, 25 Feb. 2015, gizmodo.com/the-worlds-biggest-sim-manufacturer-denies-nsa-encrypti-1687918057.&#13;
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“From Banknote Printers to International Industrial Group.” History | G D, Giesecke Devrient, www.gi-de.com/en/us/g-d-group/about-us/history/.&#13;
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Bader, Daniel. “What Is a SIM Card and What Does It Do?” IMore, IMore, 3 Dec. 2017, www.imore.com/sim-card.&#13;
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