Mexico Letter of Authorization (LOA) guidelines

Before you begin, check the basics of Mexico coverage, restrictions, and current regulations.

This page is created to address and answer the most frequently asked questions about the registration requirements for Mexico and how to complete the Letter of Authorization (LOA).

Registration requirements

To register your senders, submit the required documents based on the traffic origin of the sender.

Sender requirements

Unregistered senders will be automatically converted into a short code.
Generic senders are not allowed.
Sender name must be 3-11 characters long.
Special characters are not allowed, except for:
- space ( ),
- underscore (_),
- dot (.).

Information to prepare

Before submitting the required documents, make sure you have the following details ready, as they will also be requested by the telecom operator:

Company name
Company website
Headquarters address
Industry
Type of traffic
Traffic origin

Local senders registration

A local sender is an entity that operates within Mexico and focuses on reaching recipients who are also located within the country.

To register your sender, please provide the required documents for each network and complete the Letter of Authorization (LOA) fully and accurately.

NoteSender registration involves setup fees. For more details, reach out to your dedicated account manager or Support.

Movistar (Pegaso PCS) Mexico

Required document: Movistar sender request form (opens in a new tab)
A reference copy of the document is available in English. However, the supplier requires the completed form to be submitted in Spanish.

Fill in the following fields on the first page:

Agregador - Leave blank (this will be completed by the aggregator, Infobip).
Cliente / Marca - Enter the brand name/brand owner.
Tipo de solicitud - Select the type of request (for example, Alpha, Short Code registration) and mark the relevant option with an X.
Marcación de servicio - Add the short code (if applicable).
Tipo de marcación - Select the relevant short code type and mark with an X:
1. Dedicada - Dedicated
2. Compartida - Shared
Alta de marcación - Choose the applicable option and mark with an X:
1. MT - One-way
2. MO - Two-way
3. DLRs - Delivery reports
Tipo de tráfico - Indicate the type of traffic (for example, marketing, authentication, or utility).

On the second page of the request form, complete the service information:

Máscara - Sender name
Descripción del servicio - Service description
Fecha de lanzamiento - Release date
Reporte de fallas - Failure report contact/details
Costo de la marcación MO - MO dialing cost
Horario del servicio - Service hours
Opt-in del servicio - Service opt-in process
Opt-out del servicio - Service opt-out process
Mensajes del servicio - Service messages
Giro de la marca - Brand industry/sector
Términos y condiciones - Terms and conditions
Aviso de privacidad - Privacy notice
URL página web - Website URL

AT&T Mexico

Required document: AT&T brief request form (opens in a new tab)

When submitting, name the file using the following format:

Brief ATT_[Client Name]_[Mask or SC]_Date [DD.MM.YY.]

NoteA local entity in Mexico is required for local registration.

After you download the template, make sure to provide any considerations or comments that you or your organization believe are important for the registration process. Include service-related details such as campaigns, use cases, or other relevant information.

Also provide the launch date and any specific considerations you would like to highlight.

Then, complete the service information using the following fields:

Descripción del servicio - Service description
Marcación del servicio - Service short code
Máscara - Mask / sender name
Costo de la marcación - Service short code cost
MT - One-way messaging
MO - Two-way messaging
Opt-in del servicio - Service opt-in process
Opt-out del servicio - Service opt-out process
Keywords del servicio - Service keywords
Mensajes del servicio - Message templates
Canales de comunicación - Communication channels; how the service will be announced
Términos y condiciones - Terms and conditions
DN’s de pruebas - Test numbers, if any
Screenshot - Optional; can be provided once the sender is properly configured

Telcel

Required document: Telcel approval request form (opens in a new tab)

When submitting, name the file using the following format:

Brief Telcel_[Client Name]_[Mask]_Date [DD.MM.YY.]

After you download the template, complete the following fields in the request form:

Provide the following information:
1. Company name
2. Short code to use
3. Starting date
4. Flow and reach - Describe how the messages will be delivered. The process for delivery must be clearly defined.
5. Type of information - Indicate the type of messages to be sent (for example, transactional, notification, OTP, promotional).
Terms of agreement - Include the agreement the client will sign or receive to approve SMS delivery.
Provide the following information:
1. Approximate traffic volume
2. Aggregator name - If the client uses another provider.
3. Scheduled sending time - When the messages will be sent.
4. Date of requirement
5. Masked numbers - Specify if any masked numbers will be used.
6. Delivery Reports (DRs) - Indicate if requested.

International senders registration

An international sender operates outside Mexico, but the target recipients are located within Mexico.

Movistar (Pegaso PCS) Mexico

Required document: Movistar solicitud A2P SMS (opens in a new tab)

When submitting, name the file using the following format:

Brief Movistar_[Client Name]_[Mask or SC]_Date [DD.MM.YY.]

After you download the template, complete the following fields in the request form:

First page- general information

Agregador - Leave blank; this will be filled in by the aggregator (Infobip).
Cliente / Marca - Enter the brand name / brand owner.
Tipo de solicitud - Select the request type (for example, Alpha, Short Code Registration) and mark the relevant option with an X.
Marcación de servicio - Add the short code (if applicable).
Tipo de marcación - Select the relevant short code type and mark with an X:
1. Dedicada - Dedicated
2. Compartida - Shared
Alta de marcación - Choose the desired option and mark with an X:
1. MT - One-way
2. MO - Two-way
3. DLRs - Delivery Reports
Tipo de tráfico - Specify the type of traffic (for example, marketing, authentication, utility).

Second page - service information

Máscara - Mask / sender name
Descripción del servicio - Service description
Fecha de lanzamiento - Launch date
Reporte de fallas - Email address for reporting issues
Costo de la marcación MO - MO dialing cost
Horario del servicio - Service hours
Opt-in del servicio - Service opt-in process
Opt-out del servicio - Service opt-out process
Mensajes del servicio - Service messages / sample messages
Canales de comunicación - Communication channels (for example, SMS, Viber, WhatsApp, Voice)
Giro de la marca - Brand line / industry
Términos y condiciones - Terms and conditions
Aviso de privacidad - Privacy notice
URL página web - Website URL
DN’s de pruebas - Test numbers
Leave space reserved for Telefónica information blank.

AT&T Mexico

Required document: AT&T brief request form (opens in a new tab)

When submitting, name the file using the following format:

Brief ATT_[Client Name]_[Mask or SC]_Date [DD.MM.YY.]

After you download the template, complete the following fields in the request form:

Launch date - Planned start date for the service
Considerations - Any important comments or details you would like to highlight
Provide the following service information as below:
1. Descripción del servicio - Service description
2. Marcación del servicio - Service short code
3. Máscara - Mask / sender name
4. Costo de la marcación - Service short code cost
5. MT - One-way messaging
6. MO - Two-way messaging
7. Opt-in del servicio - Service opt-in process
8. Opt-out del servicio - Service opt-out process
9. Keywords del servicio - Service keywords
10. Mensajes del servicio - Message templates
11. Canales de comunicación - Communication channels; how the service will be announced
12. Términos y condiciones - Terms and conditions
13. DN’s de pruebas - Test numbers, if any
14. Screenshot - Optional; can be provided once the sender is properly configured

Telcel

Required document: Telcel approval request form (opens in a new tab)

When submitting, name the file using the following format:

Brief Telcel_[Client Name]_[Mask]_Date [DD.MM.YY.]

After you download the template, complete the following fields in the request form:

Provide the following information:
1. Company name
2. Short code to use
3. Starting date
4. Flow and reach - Describe the traffic flow and clearly define the process for message delivery.
5. Type of information - Indicate the type of messages to be sent (for example, transactional, notification, OTP, promotional).
Terms of agreement - Include the agreement the client will sign or receive approving SMS delivery.
Provide the following information:
1. Approximate traffic volume
2. Aggregator name - If the client uses another provider
3. Scheduled sending time - When messages will be sent
4. Date of requirement
5. Masked numbers - Specify if any masked numbers will be used
6. Delivery Reports (DRs) - Indicate if required

Once all requirements and documents are completed, you can:

Direct customers (end customers) - start the Sender ID registration process here (opens in a new tab), and click the Request Sender button under Alphanumeric Sender ID. Provide the necessary details and submit the request.
Wholesales/partner - contact [email protected] and your dedicated account manager, and provide the documents along with the required sender information.