In May 2025, the Spanish telecommunications market reported a significant increase in mobile lines, approaching 62 million, with over 500,000 portabilities recorded. This trend reflects a competitive environment where consumers are actively switching providers, prompting the need for vigilance among competition law advisors.

The CNMC, Spain's competition authority, highlights the importance of monitoring market practices to ensure compliance with regulations. Advisors are urged to be aware of potential anti-competitive behaviors, such as abuse of dominant positions or collusion among providers, which could lead to legal challenges.

The article underscores the role of the CNMC in maintaining fair competition and consumer protection. It encourages businesses and consumers to report any irregularities that may harm competition, while also providing resources to help businesses understand regulations and maintain market balance.

In terms of market concentration, Movistar, Vodafone, and MASORANGE dominate the mobile sector, holding 86.6% of active mobile lines. The total number of mobile lines reached 61.88 million, with a notable increase in M2M lines, which grew by 42.7% year-on-year. Movistar and DIGI gained customers through number portability, while Vodafone and MASORANGE lost customers.

For fixed broadband, the market saw the addition of 67,835 new lines, totaling 19.1 million, with Movistar leading in fiber optic lines (FTTH) at 33% market share. The decline in DSL and HFC lines indicates a shift towards fiber technology.

Competition law advisors should closely monitor the significant market concentration among the top three mobile providers and the implications for customer retention and technology shifts. The decline in number portability may suggest reduced competition or customer dissatisfaction, warranting further scrutiny.