Spain's telecom market (fixed and mobile) is liberalized and regulated by the CNMC, which oversees operator competition, number portability, and technical/administrative procedures for switching providers. Prepaid SIM cards require identity registration by law. Contract cancellations must be processed by the operator within a short fixed window per the government's telecom users office, though some commonly cited consumer figures (contract permanence caps, one-month notice for condition changes) come from secondary legal-summary sources of the General Telecommunications Law rather than being independently re-verified against the BOE article text in this session, and are flagged accordingly.
Newcomers need to know that switching operators (portability) is a protected right with a regulator-defined process, that a prepaid SIM cannot be activated anonymously, and what to expect regarding cancellation timelines and contract terms so they aren't caught by unexpected penalties or delays.
Key Facts
**Regulator**: The telecom market is regulated by the CNMC, which is responsible for number portability rules (via Circulars 1/2008, 1/2009, and 1/2012) and technical specifications for both fixed and mobile portability, and states that number conservation (portability) is "an essential right of subscribers to the publicly available telephone service."
**Portability covers**: geographic (fixed) numbers, special-rate numbers, and mobile numbers, each with their own technical and administrative procedure specifications published by CNMC.
**Cancellation processing time**: Per the official government telecom users office (Oficina de Atención al Usuario de Telecomunicaciones, part of the Ministry), users have the right to cancel with their operator at any time, and the operator is obliged to process the cancellation within **2 (business) days**.
**Mandatory prepaid SIM registration**: Under the Disposición Adicional Única of Ley 25/2007, de 18 de octubre, de conservación de datos relativos a las comunicaciones electrónicas y a las redes públicas de comunicaciones (BOE-A-2007-18243), mobile operators selling prepaid SIM cards must keep a mandatory register (libro-registro) recording the identity of purchasers. For individuals: name, surname, nationality, and ID document type/number (DNI, passport, or foreigner ID card/NIE). For legal entities: tax ID (CIF) and company name.
**Contract permanence and notice periods**: Multiple non-official legal-summary sources describe Ley 11/2022, de 28 de junio, General de Telecomunicaciones (BOE-A-2022-10757) as capping any minimum-stay commitment (compromiso de permanencia) at **24 months**, and requiring operators to give **1 month's** notice before changing contract conditions (with a right to cancel penalty-free if the user rejects the change). **Flagged as unconfirmed in this session**: the specific BOE article text for these two figures was not successfully retrieved directly from boe.es during this research session (the full law text is too large to excerpt via the tools used); treat the 24-month cap and 1-month notice as needing direct confirmation against the BOE-A-2022-10757 text before being presented as a hard-verified figure.
**Operator switching without changing SIM**: Ley 11/2022 is reported (by CNMC-adjacent commentary) to promote operator switching without requiring a new physical SIM card, and to allow users to switch internet providers even for services not tied to a phone number — **also not independently re-verified against BOE article text in this session**.
Steps
1. Choose an operator and plan — Compare mobile/fixed/converged (bundled) offers from CNMC-regulated operators.
2. Provide ID for SIM registration — For any prepaid SIM, present a DNI, passport, or NIE (foreigner ID card) — registration is mandatory by law before the SIM can be activated.
3. Request portability if switching from another operator — Ask the new operator to initiate the portability request; the process is governed by CNMC technical/administrative specifications for fixed or mobile numbers respectively.
4. Confirm contract terms before signing — Check any minimum-stay commitment period and notice requirements in the contract itself — do not rely solely on general figures without confirming what your specific operator has included in your contract.
5. To cancel, notify your operator directly — The operator must process a cancellation request within the timeframe confirmed by the government telecom users office (2 business days).
Timelines
Cancellation processing: 2 business days (per Oficina de Atención al Usuario de Telecomunicaciones).
Maximum contract permanence commitment: reported as 24 months (unconfirmed against direct BOE article text in this session).
Notice before contract condition changes: reported as 1 month (unconfirmed against direct BOE article text in this session).
Required Documents
DNI, passport, or NIE (foreigner identity card) — mandatory for prepaid SIM registration under Ley 25/2007.
Proof of address may be requested by individual operators for postpaid/fixed-line contracts (operator-specific; not a sourced government requirement in this session).
Common Mistakes
Trying to activate a prepaid SIM without presenting valid ID — this is a legal requirement, not optional operator policy.
Assuming contract permanence terms are identical across all operators — the reported 24-month cap is a ceiling, not a fixed rule, and individual contracts can set shorter terms.
Not requesting portability formally through the new operator, which is the process the CNMC's specifications are built around.