Spain will reorganize part of its telephone numbering system to prevent mobile numbers from running out prematurely. The Ministry for Digital Transformation and Public Function has published a resolution requiring machine-to-machine services, known as M2M, to use a specific 13-digit numbering range with the 59 prefix starting July 1, 2026. From that date onward, new services of this type will no longer be able to use conventional mobile numbers.
The change affects device-to-device communications, a category that has grown significantly due to the expansion of the Internet of Things (IoT). Examples include connected elevators, alarms, agricultural sensors, automotive systems, telemetering equipment, remote control devices, and remote management solutions—many of which have traditionally used regular mobile numbers. However, the rapid growth of these uses has begun to pressure a limited resource.
The 59 Prefix Will Be Mandatory for New M2M Services
The resolution sets a clear deadline: from July 1, 2026, M2M services requesting new numbers will need to use the 59 range with 13-digit numbers. Conventional mobile numbering will no longer be available for new allocations of this kind.
In fact, the 59 range is not new. Spain already allocated a specific numbering range for machine-to-machine communications in 2010. What is changing now is that it will no longer coexist equally with traditional mobile numbering for new requests. The government aims to better distinguish human phone usage from automatic device-to-device communications.
The primary reason is efficiency. Mobile numbers were designed for personal or professional lines used by people, but with IoT’s development, they have also become associated with machines. Each sensor, alarm, connected elevator, or remote device may need its own line for communication. While this may seem insignificant on a small scale, on a national level, the impact is substantial.
The Ministry estimates that this measure will free up nearly three million mobile numbers currently used for M2M services. These resources can then be allocated for conventional mobile services, helping to prevent premature exhaustion of mobile numbering capacity.
The transition will not be immediate for everyone. M2M services currently operating with mobile numbers will have until January 1, 2031, to migrate to the 59 prefix. This timeline provides more than four years to adapt platforms, contracts, SIM cards, internal systems, databases, alarms, and deployed devices.
What Changes for Companies with Connected Devices
For individual users, this change should not directly affect their personal mobile lines. No one will need to change their personal number because of this resolution. The main impact will fall on operators, IoT connectivity providers, integrators, device manufacturers, and fleet management companies.
Companies with sensors, elevators, alarms, automotive devices, or telemetering systems using mobile numbers will need to plan their migration before 2031. Depending on the case, this might involve changes to SIM cards, management platforms, inventory systems, contracts with operators, databases, and maintenance procedures.
The available timeline is ample, but it’s advisable not to leave this to the last moment. In industrial or critical service environments, changing numbers is not just an administrative task; it can affect technical alarms, emergency communications, equipment in remote locations, or systems that are infrequently checked. The risk lies less in the regulatory change itself than in poorly planned migration.
There is also a market perspective to consider. Separating human mobile numbering from M2M numbering can help better organize the IoT ecosystem. Clear identification of ranges simplifies management, traceability, and resource planning for operators and clients. For government, this improves the use of the National Telephone Numbering Plan.
Nomadic Voice Services Are Also Changing
The Ministry has also issued a second resolution concerning nomadic voice services—services provided via IP-based voice communication that are not strictly tied to a fixed location.
Starting with this update, these services will only be able to use numbers starting with 51. The use of provincial numbering within the 8XY code for these services will be discontinued. The goal is to free up these resources for traditional fixed-line telephone services, especially in provinces where fixed-line numbering might face exhaustion.
The resolution provides a six-month period for maintaining these numbers, subject to approval by the National Commission on Markets and Competition. The change is justified by the low efficiency of geographic nomadic numbering—below 5%, according to information released by the Ministry.
This adjustment highlights a common issue in numbering management: having available ranges in theory is not enough; they must also be used efficiently. Reserving geographic ranges for low-occupancy uses can unnecessarily block resources needed for conventional fixed-line telephony in certain provinces.
An Update Driven by IoT Expansion
Both resolutions stem from recommendations by the CNMC and aim to make numbering usage more straightforward and transparent. In the case of M2M, the change reflects a clear technological trend: increasing numbers of connected devices, many of which do not require traditional mobile numbers designed for human use.
The measure also anticipates broader IoT expansion. Connected agriculture, mobility, industry, energy, smart buildings, security, logistics, and connected cities will continue deploying sensors and remote systems. If these devices continue to consume traditional mobile ranges, the system can become unnecessarily strained.
The 59 prefix allows for the segregation of these uses and prepares for future growth. While it may seem like a minor technical issue, telephone numbering is a fundamental infrastructure. Poor management can lead to blockages, resource shortages, urgent migrations, and difficulties in launching new services. Proper planning ensures a more orderly impact on users and companies.
The chosen timeline aims to achieve that: new M2M numbers will need to use 59 starting July 2026, while existing lines have until January 2031 to complete migration. This timeframe offers flexibility but marks the end of a period during which machines and personal mobiles shared numbering resources inefficiently.
For companies with extensive IoT deployments, a practical recommendation is to review inventory as soon as possible. Knowing how many M2M lines use mobile numbering, where they are installed, who manages them, and what systems depend on them will be the first step to avoid last-minute rushes at the end of the transition period.
Frequently Asked Questions
What changes with the new M2M numbering?
Starting July 1, 2026, new machine-to-machine services will be required to use 13-digit numbers starting with 59. They will no longer be able to request conventional mobile numbers.
What about existing M2M devices already using mobile numbers?
They will have until January 1, 2031, to migrate to numbers with the 59 prefix.
Does this change affect users’ mobile numbers?
No. This measure applies to M2M and IoT services, not to personal or professional mobile lines used by individuals.
What about the nomadic voice services?
These services will only be able to use numbers starting with 51. The use of provincial 8XY numbers will be discontinued to free resources for traditional fixed-line telephony.