List of authoritative, publicly accessible sources used for the drafting of this Knowledge Pack. All content is written in our own words based on these sources; no verbatim text from commercial or copyrighted standards is reproduced. Technical standards are cited by number (e.g., "3GPP TS 23.501") in compliance with policy KH-QA-04.
GSMA - Global System for Mobile Communications Association
https://www.gsma.com/
The GSMA is the international association of mobile operators. It publishes de facto standards and industry guidelines: eSIM SGP.22 v3.0 (Consumer eSIM), SGP.02 (M2M eSIM), IPX IR.34 (inter-operator IP backbone), VoLTE IR.92, RCS RCC.07 Universal Profile, security guidelines FS.11 (SS7 vulnerabilities), FS.19 (Diameter), FS.20 (5G identity), PRD IR.26 (MNP), IR.21 (Roaming Information Document). Also publishes GSMA Intelligence (market statistics: ARPU, churn, connections). This is the primary EN-language source for industry standards and market data cited in this pack.
3GPP - 3rd Generation Partnership Project
https://www.3gpp.org/
3GPP is the international consortium producing mobile network specifications: TS (Technical Specification) and TR (Technical Report) for GSM, UMTS, LTE, and 5G NR. Specifications cited in this pack include: TS 23.501 (5G System Architecture), TS 38.101-1/-2 (5G NR UE radio), TS 38.300 (5G NR RAN), TS 33.501 (5G security), TS 23.228 (IMS), TS 36.300 (E-UTRAN), TS 23.401 (4G EPC), TS 29.002 (MAP/HLR), TS 29.503 (UDM), TS 29.244 (UPF), TR 38.901 (5G channel model), TR 22.261 (5G service requirements), TS 36.211 (NB-IoT physical layer), TS 26.441 (EVS codec). All 3GPP specifications are freely accessible on the official website.
ETSI - European Telecommunications Standards Institute
https://www.etsi.org/
ETSI produces EN (European Norm) and TS (Technical Specification) standards relevant to this pack: ETSI GS MEC 003 (MEC architecture reference), ETSI GS MEC 002 (MEC requirements), ETSI GS NFV 002 (NFV architecture), ETSI ES 201 671 (Lawful Interception, HI1/HI2/HI3), ETSI EN 300 175 (DECT), ETSI TS 100 900 (SMS). ETSI publications are accessible via the ETSI public portal.
ITU-T - International Telecommunication Union - Telecom Standardisation Sector
https://www.itu.int/en/ITU-T/
The ITU-T issues international Recommendations relevant to this pack: G.984 (GPON, Gigabit Passive Optical Network), G.9807 (XGS-PON, 10 Gbps symmetric PON), E.164 (international telephone numbering plan), E.212 (IMSI / MCC+MNC identification), Q.700 series (SS7 Signalling System 7), Y.2001 and Y.2011 (NGN architecture), M.3010 and M.3060 (TMN/OSS reference). ITU-R M.2083 (IMT-2020 - 5G requirements framework). WRC decisions are contained in the Radio Regulations.
AGCOM - Autorità per le Garanzie nelle Comunicazioni (Italy)
https://www.agcom.it/
AGCOM is Italy's national regulatory authority for electronic communications, established by Law 249/1997. Relevant publications: delibere on MTR (179/17/CONS), MNP (147/11/CIR), net neutrality enforcement, per-second billing (418/07/CONS), Piano Nazionale di Assegnazione delle Frequenze (PNAF), Osservatorio sulle Comunicazioni (quarterly market statistics). Referenced for Italy-specific regulatory figures and procedures in this pack.
Regulation (EU) 2015/2120 - Open Internet / Net Neutrality
EU Regulation establishing open internet access (net neutrality) obligations for ISPs and MNOs. Published on EUR-Lex with open reuse licence. Cited for net neutrality provisions and zero-rating analysis in this pack.
BEREC - Body of European Regulators for Electronic Communications
https://www.berec.europa.eu/
BEREC coordinates national NRAs and publishes: Net Neutrality Guidelines (binding guidelines for Regulation 2015/2120 implementation), roaming implementation reports, mobile termination rate (MTR) common positions, 5G rollout reports. Referenced for EU regulatory frameworks cited in this pack.
Wikipedia - Telecommunications (EN)
https://en.wikipedia.org/wiki/Telecommunications
The English-language Wikipedia article on telecommunications provides a public-domain overview (CC-BY-SA). Used for cross-checking general definitions and orientation. Not used for standard-specific technical data (which is attributed to primary sources: 3GPP/ETSI/ITU as above).