Relevant report by Srlabs.de: http://gsmmap.org/assets/pdfs/gsmmap.org-country_report-United_States_of_America-2013-08.pdf http://gsmmap.org/assets/pdfs/gsmmap.

Relevant report by Srlabs.de: http://gsmmap.org/assets/pdfs/gsmmap.org-country_report-United_States_of_America-2013-08.pdf http://gsmmap.org/assets/pdfs/gsmmap.org-country_report-Unit... Conclusion: The GSM networks in USA implement only few of the protection measures observed in other GSM networks. Encryption algorithms: AT&T T-Mobile A5/0 45% 17% (ie: unencrypted) A5/1 55% 83%