CNMC: What the latest available data show about telecommunications in Spain

The CNMC maintains several statistical series for tracking telecommunications in Spain. At the time of consultation, its quarterly general data set ran through the first quarter of 2026 and was listed as updated on 16 July of that year. It includes information on revenue, investment, employment and bundled services. The quarterly series dedicated to markets also covered 2026Q1 and brought together indicators such as lines, traffic, customers and infrastructure. The publication date and the period measured are two different things: an update in July does not mean that the figures describe July.

There is also a monthly series on lines and number portability that extended through July 2026, with its latest update shown as 23 September. So saying that “the latest telecommunications data” refer to a single month can be misleading: it depends on the variable being consulted. For revenue or investment, the reference available here is quarterly; for lines and number portability, it is monthly. Before comparing figures, it is worth confirming the latest period covered by the specific data set, rather than applying one common date to all statistics. The different publication schedules mean that there is no single period that can stand in for every indicator.

The general data help track overall sector measures, including revenue, investment, employment and the presence of bundled services. The market series adds information on lines, traffic, customers and infrastructure across the main markets and operators. The monthly series, in turn, focuses on lines and number portability. The CNMC describes the quarterly series as information on Spain’s main markets and operators, and offers downloads in formats such as CSV, JSON, XML and RDF, as well as an API. These formats make the data available for consultation and further analysis, but do not change what each indicator measures.

This distinction helps identify the right indicator before drawing a conclusion. If the question is whether more customers changed provider, the monthly number-portability series is more relevant than revenue data; if the aim is to study economic activity, the general quarterly data are more appropriate. One statistic cannot replace another: the number of lines does not, by itself, measure service quality, and aggregate revenue does not show how much each household pays. To interpret the market, the first step is to specify which aspect needs explaining. Being clear about that question also helps prevent a figure from being used to support a conclusion that it was not designed to answer.

A single figure tells us the level observed, but it is not enough to establish a trend. In quarterly series, a year-on-year comparison sets one quarter against the same quarter in the previous year; a comparison with the immediately preceding quarter may reflect seasonal effects or one-off changes. For monthly data, the same principle means comparing, for example, July with July, not necessarily with June. The appropriate choice depends on the question, and it should be made explicit whenever a change is presented. A comparison is only meaningful once the periods being compared have been identified.

It is also important to check that both observations belong to the same series and retain comparable definitions. The portal identifies separate historical-period data sets for quarterly market statistics; it is unwise to concatenate them without reviewing their methodological notes and data dictionaries. The material consulted does not provide a detailed values table here from which to calculate changes independently. Accordingly, this article does not assign growth percentages to lines, revenue or investment, nor does it turn press-release headlines into a complete statistical series. Those limits matter: an observation or headline is not, on its own, a calculation of a trend.

Press releases offer clues about some results, but they do not replace downloading the data or considering the context of each indicator. In its first-quarter 2026 communication, the CNMC highlighted an increase in mobile data traffic. Another publication, covering May, said that mobile lines were close to 63 million. In March, the institution reported that FTTH fibre-optic lines had exceeded 18 million. These refer to different periods and measures, and should not be combined as though they described a single statistical snapshot. Each headline points to a particular piece of information, rather than a complete account of the sector.

The fourth-quarter 2025 release highlighted a slight increase in retail revenue and strong growth in mobile traffic. The annual report published in June 2026, by contrast, said that the telecommunications and audiovisual sector grew by 2.2% in 2025. That percentage applies to the scope and definition used in the annual report; it should not automatically be attributed to every operator, service or bill. The available extracts do not provide enough methodological detail to reconstruct the calculation here or make independent comparisons. Keeping those distinctions visible helps avoid treating figures from different publications as directly interchangeable.

The series can help put changes in market composition, network use or sector activity into context. For consumers, movements in lines or number portability can provide information about activity in the market, but do not, by themselves, prove that offers have improved, prices have fallen or satisfaction has risen. For businesses, aggregate data can provide a framework for analysing the sector, although they do not replace specific information about coverage, costs, contracts or quality in a particular area. Their value lies in what they can show at their stated level of aggregation, not in answers they were not designed to provide.

A practical check before citing a figure is to note the data set, indicator, unit and period, then review the methodological notes and choose a comparable period. It is also worth identifying whether the source is a quarterly statistic, a monthly statistic or an annual report. The research available here does not include an independent analysis with which to test the CNMC’s conclusions. The soundest reading is therefore a limited one: official series are updated on different schedules, but conclusions about prices, quality or competition require additional evidence. Making those boundaries clear allows the data to be used without overstating what they establish.