Send Certified SMS with legal validity at a reduced cost.
Sending Certified SMS - Security and Legal Validity
Certified SMS allow communications to be sent with full legal guarantee and legal certainty, making them binding and valid evidence in any administrative, legal or judicial process.
Signup and start using this service with LabsMobile
Start now!What is a Certified SMS message and what is it used for?
A Certified SMS has all the features of a standard SMS adding the certainty that the SMS communication has been carried out and the confirmation of all its elements.
In other words, a certified SMS equivalent to a bureaufax with the same validity but with capacity restrictions and at a much lower cost.
The main uses of a certified SMS are:
- Claims for non-payment.
- Communications to employees or workers.
- Notifications during any administrative or legal process.
How does a Certified SMS work?
A certified SMS is sent over the GSM network, just like a traditional or standard SMS. However, the mobile operator that manages the delivery of the SMS has been validated as a communications certification authority.
The telephone operator acts as a trusted third party (like a notary) and has the power to issue binding documents that confirm and validate the SMS communication.
A certified SMS has the same capacity as a standard SMS (160 characters). In addition, it is possible to send certified concatenated and/or unicode messages. Due to the regulations of this service, the certifying operator adds at the end of the message the text "(CERTIFIED SMS)".
When the operator confirms the delivery (or error) in sending the message, a document in PDF format is generated with the following content and functions:
- Identifies the certifying telephony operator.
- Confirms that the communication has been carried out, specifying the specific time of sending and the final status of the message (delivered or error).
- Certifies the content (text) and other elements of the message (recipient, sender, etc.).
This digitally signed and unalterable document is the proof that certifies the communication and is valid in any legal or administrative process.
It is possible to send certified SMS from our Web Application (by enabling the functionality in the Account Preferences) or through the API SMS. See more information on how to integrate and automate sending certified SMS in our API documentation.
In which countries is a Certified SMS valid?
This service is available in the following countries:
- European Union: Belgium, Bulgaria, Czech Republic, Denmark, Germany, Estonia, Ireland, Greece, Spain, France, Croatia, Italy, Cyprus, Latvia, Lithuania, Luxembourg, Hungary, Malta, Netherlands, Austria, Poland, Portugal, Romania, Slovenia, Slovakia, Finland and Sweden.
- Argentina
- Brazil
- Chile
- Colombia
- Peru
- Mexico
- Dominican Republic
- Ecuador
- Uruguay
- Venezuela
- Guatemala
- Panama
- Costa Rica
We are working to expand this coverage. Ask us if you are interested and your country is not listed.
Benefits of Certified SMS
Certified SMS is a tool with full legal value, equivalent to a certified letter or burofax. This ensures that both the content of the message and its delivery are recorded and can be used as evidence in any legal procedure.
Legal Validity
Companies can use the HLR Check to validate databases before launching mass SMS and call campaigns, improving effectiveness and avoiding unnecessary costs.
Guaranteed Delivery and Reception
Each Certified SMS includes proof of sending, delivery and exact content of the message. This provides complete traceability, ensuring transparency in communications.
Security in Transactions
Ideal for sensitive notifications, such as contracts, legal confirmations or important notices. Certified SMS protects the information sent through encryption and secure protocols.
Cost and Time Reduction
Compared to traditional alternatives such as postal mail, Certified SMS is faster, cheaper and more accessible. The immediacy of digital communication saves time and resources without compromising efficiency.
Global Accessibility
Certified SMS can be sent to any mobile device, without the need to install additional applications, ensuring that they reach the recipient without complications, regardless of their location.
Certified Content Record
Unlike a conventional SMS, Certified SMS keeps a detailed record of the content sent, eliminating any possibility of disputes over the information communicated.
Regulatory Compliance
Using Certified SMS ensures compliance with data protection regulations and legal standards in multiple sectors, such as finance, healthcare or law.
Improved Customer Experience
Users value the clarity and reliability of certified communications. This strengthens trust and the professional perception of your brand.
Practical Applications of Certified SMS
- Legal and Contractual Notifications
- Important Business Communications
- Human Resources Management
- Appointment and Reservation Confirmation
- Financial and Payment Notifications
- Judicial and Administrative Processes
- Service Reminders and Renewals
- Delivery and Order Confirmation
- Security Notices and Critical Alerts
- Administrative Communications in Public Entities
How much does a Certified SMS cost?
The activation or maintenance of the certified SMS service is free of charge. Only certified messages sent are charged.
The credits corresponding to the length of the SMS will be deducted:
Up to 160 characters | 11 credits |
From 161 to 306 characters | 12 credits |
From 307 to 459 characters | 13 credits |
From 460 to 612 characters | 14 credits |
From 613 to 765 characters | 15 credits |
More information on How much does an SMS cost?.
How to activate the Certified SMS delivery service?
These are the steps to activate and send Certified SMS in the LabsMobile platform:

Our team of experts
can help you
Interested in our services?
Our managers and technical team are always available to answer all your questions about our SMS solutions and to advise you on the implementation of any action or campaign.
Contact us