This 2005 post from the NSA’s internal newsletter SIDToday explains how the agency overcame the obfuscation of IMSI codes by mobile phone companies: see the Intercept article NSA Used Porn to “Break Down Detainees” in Iraq — and Other Revelations From 297 Snowden Documents, 1 March 2018.
This 49-page March 2009 NSA presentation explains how to conduct searches within XKeyScore: see the Intercept article XKEYSCORE: NSA’s Google for the World’s Private Communications, 1 July 2015.
This GCHQ research paper dated 12 November 2010 discuss some of the agency’s attacks against iPhone handsets: see the Der Spiegel article The Digital Arms Race: NSA Preps America for Future Battle, 17 January 2015.
This undated joint GCHQ/CSEC presentation provides an overview of “exploring and exploiting leaky mobile apps”: see the Der Spiegel article The Digital Arms Race: NSA Preps America for Future Battle, 17 January 2015.
This ODNI briefing from 15 May 2007 describes the rationale for ICREACH and the scale of metadata sharing that was envisioned: see the Intercept article The Surveillance Engine: How the NSA Built Its Own Secret Google, 25 August 2014.
This slide lists the range of selectors the Turmoil infrastructure at UK base Menwith Hill can use to identify targets, many of which show the ability of Five Eyes agencies to piggyback on commercial services: see the Intercept article How the NSA Plans to Infect ‘Millions’ of Computers with Malware, 12 March 2014.
Two images from an NSA presentation describe Dutch-US cooperation in an international mission against Somali pirates in which signals intelligence was used to map contacts and support a naval mission. Identifying and technical details have been redacted: see the NRC Handelsblad article The secret role of the Dutch in the American war on terror, 5 March 2014.
This NSA presentation from May 2010 describes the kinds of information the agency can extract from smartphone traffic, describing the use of mobile apps as a “golden nugget”. Note that this is the first version of this document released online: see the Pro Publica article Spy Agencies Probe Angry Birds and Other Apps for Personal Data, 27 January 2014.