This NSA presentation from May 2009 describes the procedure for analysing phone data within XKeyScore: see the Intercept article XKEYSCORE: NSA’s Google for the World’s Private Communications, 1 July 2015.
This GCHQ document from June 2010 describes cooperation between members of the Five Eyes alliance, particularly Canada’s CSEC, on the technical analysis of international mobile phone networks: see the Intercept article Operation Auroragold: How the NSA Hacks Cellphone Networks Worldwide, 4 December 2014.
This 23 Febrauary 2010 post from the internal NSA newsletter SIDToday describes advances in the agency’s capabilities against 4G signals, described as “a very high priority for NSA and the Intelligence Community”: see the Intercept article Operation Auroragold: How the NSA Hacks Cellphone Networks Worldwide, 4 December 2014.
This 19-page NSA paper, delivered at the 2010 Five Eyes SIGDEV conference, gives a technical explanation of the importance of sourcing mobile carriers’ roaming agreements (IR.21): see the Intercept article Operation Auroragold: How the NSA Hacks Cellphone Networks Worldwide, 4 December 2014.
This undated NSA Special Source Operations memo explains MYSTIC a collaboration between various US agencies that collects signals from telecoms networks by means of devices have been installed for ostenisbly “legitimate commercial services”: see the Intercept article Data Pirates of the Caribbean: The NSA Is Recording Every Cell Phone Call in the Bahamas, 19 May 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.
This six-slide presentation from November 2009 details mobile phone interception in Indonesia by Australia’s Defence Signals Directorate (now the Australian Signals Directorate): see the Guardian article Australia tried to monitor Indonesian president’s phone, 17 November 2013.