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Telefónica S.A. is a leading multinational telecommunications company headquartered in Madrid, Spain, providing a comprehensive suite of services across Europe and Latin America. It offers mobile services including voice, data, internet, roaming, fixed wireless, trunking, and paging, alongside traditional fixed-line telecommunications such as PSTN lines, ISDN accesses, public telephony, local and international long-distance calls, corporate communications, and value-added supplementary services. The company also delivers broadband internet access, fiber-to-the-home, high-speed digital subscriber lines, VoIP, leased lines, virtual private networks, fiber optics, web hosting, managed services, content delivery, cybersecurity, outsourcing, system integration, and professional consulting. Additionally, Telefónica S.A. provides wholesale services for other operators, video/TV platforms, IoT products, financial services, cloud solutions, big data, digital experiences, and innovative offerings like Aura, open gateway, and smart devices. With a presence in key markets including Spain, the UK, Germany, and Brazil, it continues to invest in 5G networks, fiber expansion, cybersecurity, data centers, and strategic mergers to enhance its competitive position in the global telecom sector.