How to receive SMS in Spain for free
Using a temporary Spanish number on asms.ai takes three steps and requires no setup whatsoever.
First, open asms.ai and browse the list of available numbers. Filter by country and select any number showing a Spanish +34 prefix. The number is live immediately, no activation required.
Second, enter that number into whatever app or website is asking for a Spanish mobile number. Submit the form to trigger the SMS verification message.
Third, return to the number's public inbox page on asms.ai and refresh. The incoming SMS typically appears within 30 seconds. Copy the OTP code and complete your verification.
That is the entire process. You do not need to create an account, verify an email address, or provide payment details. The number and its inbox are shared and publicly visible, which is exactly what keeps the service free. If you need a dedicated Spanish number with a private inbox, asms.ai offers paid private numbers as an upgrade, but for standard one-time verification the shared tier is all you need.
Is it genuinely free?
Yes. Every shared number on asms.ai is completely free to use. There are no hidden fees, no trial periods, and no credit card required at any point in the process.
The service is funded by its premium tiers: private numbers dedicated to a single user, and a REST API plus native MCP server for developers and AI agents who need reliable, programmable SMS reception at scale. Those paying customers make it possible to keep the shared numbers free for everyone else. There is no advertising anywhere on asms.ai.
If you are a developer building automations or an AI workflow that needs to receive SMS programmatically, the API tier is designed for exactly that use case. For occasional, manual verifications using a free Spanish number, the shared tier is more than sufficient.
Why use a temporary Spanish number specifically?
Several legitimate situations call for a Spanish +34 number in particular, rather than a number from any other country.
Registering for a Spanish streaming service, regional news site, or local classifieds platform often requires a local mobile number because the platform validates the country code before sending the OTP. A +34 number satisfies that check without you needing a Spanish SIM card.
Travellers visiting Spain who do not want to purchase a local prepaid SIM but need to register for a local transport app, parking system, or city Wi-Fi portal will find a temporary Spanish number handles the job cleanly. Hotel and municipal networks frequently gate Wi-Fi access behind an SMS code sent to a local number.
Businesses testing localisation of their own SMS verification flows need a real Spanish number to confirm the OTP actually arrives, displays correctly, and clears the platform's own validation logic for Spanish users. Using a shared asms.ai number for this kind of QA testing is considerably faster and cheaper than sourcing a dedicated test SIM.
Researchers, journalists, and privacy-conscious users accessing Spanish-language platforms may prefer not to link their personal number to a foreign service. A temporary Spanish number keeps personal contact details out of third-party marketing databases without requiring any compromise on the registration itself.
In all of these cases, the shared nature of the number is acceptable because you are only reading a one-time code, not conducting private conversation. The code is short-lived, and reading it from a public inbox exposes nothing sensitive beyond those few digits.
Privacy and security: what you need to know
Using a shared public number means every message sent to that number is visible to anyone who visits the inbox page. This is a deliberate design property, not a bug, and it is important to understand before you use the service.
Do not use a shared asms.ai number for anything involving personal, financial, or sensitive communication. It is designed exclusively for receiving one-time verification codes where the only information transmitted is a short-lived numeric code you read once and then discard.
Your own identity and real phone number stay completely out of the picture. You never submit any personal details to asms.ai to use the free tier. The service does not require cookies to track your session or an account to store your history.
If you need a number that only you can see, asms.ai offers private numbers as a paid upgrade. A private number is dedicated to your account, its inbox is visible only to you, and it behaves identically to a personal number from the perspective of the platform you are verifying with. That makes private numbers the right choice for two-factor authentication on accounts you actually care about, or any workflow where inbox privacy matters.
For standard one-time SMS verification on services where the code itself is the only sensitive element, the free shared tier is the correct and intended tool.
Will every Spanish platform accept a virtual number?
Most SMS verification flows accept any valid +34 number, including shared virtual numbers. The platform sends the OTP, it arrives in the inbox, and you copy it. This works reliably for the large majority of apps and websites you are likely to encounter.
Some platforms have begun screening against known VoIP and virtual number ranges in an attempt to enforce stricter identity checks. If a platform rejects the number you selected, try a different +34 number from the list. Different numbers sit in different ranges and are recognised differently by screening services, so switching numbers often resolves the issue. If Spanish numbers are consistently rejected by a specific platform, it is worth considering whether that service is intentionally requiring a genuine personal SIM.
asms.ai adds new numbers regularly. Newer numbers are less likely to appear on block lists, which is one reason the daily refresh of available numbers matters practically rather than just cosmetically.
Being direct about limitations: a small category of platforms, particularly major financial institutions, government portals, and some identity-verification services, will not accept virtual numbers under any circumstances. For those cases, a personal SIM or a private dedicated number is the only workable option. asms.ai cannot override that policy on the platform's side.
Common verification use cases with a +34 number
A temporary Spanish number works for any service that sends SMS to Spain. The most common use cases span several categories.
Social media and messaging platforms: creating a secondary account or restoring access to an account where you want to keep your personal number private. A Spanish number is useful specifically when the platform you are registering with expects a local country code.
Marketplace and classifieds sites: Spanish platforms such as Wallapop and Milanuncios use phone verification to reduce fraudulent listings. A temporary +34 number passes that check for initial registration without exposing your real number to the platform's database.
Ride-hailing and delivery apps operating in Spain often require a local number during initial registration, even if the account is later used internationally. A shared Spanish number satisfies the registration step cleanly.
Wi-Fi and telecom portals: hotel, airport, and municipal Wi-Fi networks across Spain routinely gate access behind an SMS code sent to a local number. A temp Spanish number resolves this without committing your personal number to a portal you will never use again.
Gaming and entertainment platforms sometimes use phone verification as a soft regional signal, and a +34 number satisfies this for Spanish-market content. Software trials and developer tools that limit one account per user often use the same phone-gate mechanism. A temporary number lets you evaluate a product without tying the test account to your main identity.
For developers building and testing their own SMS verification logic, a shared Spanish number is a quick way to simulate a real end-user registration from Spain without purchasing test infrastructure.
Number availability and how the pool stays current
asms.ai maintains a rotating pool of Spanish and international numbers. Numbers from Spain, the United States, the United Kingdom, Germany, Georgia, Ukraine, and several other countries are available at any given time, with new numbers added daily.
Inboxes are periodically wiped. This keeps each public inbox readable and prevents old codes from cluttering the view, but it also means you should read and use a code promptly after it arrives. Do not expect a code sent several hours ago to still be visible.
If a number you previously used is no longer listed, it has likely been retired and replaced. The list on the site always reflects currently active numbers.
The diversity of countries and number ranges is intentional on two levels. For users, it provides alternatives when a specific Spanish number is rejected by a particular platform. For developers and researchers, it means you can test SMS verification flows across multiple regions without sourcing SIMs from each individual country. The combination of geographic breadth and daily number refresh is what keeps the service practically useful over time rather than degrading as block lists accumulate.