European Telecommunications Standards Institute: Standardization, Telecommunication, GSM

3GPP: 3G, Mobile phone, International Telecommunication Union, GSM, European Telecommunications Standards Institute

European Committee for Electrotechnical Standardization: Standardization, Electrical engineering, Telecommunication

European Committee for Standardization: Single market, Union, Electrotechnical Standardization

DIN Standards: Standardization, Deutsches, Institut, ISO 128