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Mexico Short Codes Best Practices

The following topics are discussed in this guide. Click a topic to skip directly to this information:

To apply for Mexico Short Code please follow the guidelines here.

Mexico Short Code Content Restrictions

See the table below for the type of content that is or is not allowed in Mexico.

Please also refer to Twilio’s AUP for additional content restriction details. 

Type of Message Content


Not Allowed






Illegal products or services














Political causes / politicians









Sensitive data (end user)



Sexual content (explicit)



Spam / phishing**



Special offers*


Third-party rights violations (copyrights, registered trademarks)




* With prior operator approval. Submit content for approval that includes service specs such as a description of the service, content samples of the body text, and possible URLs you will use.

** Operators pay special attention to abuse-related content like spam and phishing. In most cases, use of such content automatically leads to termination of the service agreement and disconnection of the short code(s) involved. Operators in Mexico hold ownership for content and filtering upon their own criteria of compliance.

Other Mexico Short Code Restrictions

Restriction type

In general, you should communicate only during an end user’s daytime hours in Mexico.

For some types of short codes, providers may set a time frame during which customers cannot send marketing messages, such as between 20:30 and 08:00 (CDT).

Messages sent during restricted hours will be rejected and you will need to resend them when the approved window reopens.

URL Usage

To prevent phishing and misleading content that derives in criminal activity, you should use only pre-approved URLs in messages.

Note that if you obtain content approval and then send phishing content, operators may block your messages and the local telecom partner may take additional actions that include, but are not limited to:  

    • Strengthening controls around user data
    • Mapping message content to avoid violating this policy
    • Imposing fines


Mexico Short Code Opt-In Requirements

Opt-ins must be handled by the customer. Opt-in process is not regulated, but must be very well documented on the customer side in Terms and Conditions.

There is no specific regulation on opt-in process, but carriers can request evidence of opt-in at any time, so following these best practices is recommended:

  • Prior consent or right to opposition will be collected by means of a checkbox, either online or offline. Pre-checking the box as default is to be avoided at all times.
  • Advertising by SMS is possible provided that people have explicitly agreed to be approached, at the time of collection of their mobile phone number.

Two exceptions to this principle:

  • if the person being prospected is already a client of the company and the prospecting concerns products or services similar to those already provided by the company.
  • if the prospect is not of a commercial nature (charitable for example).

In both cases, the person must, at the time of collecting his telephone number:

  • be informed that their mobile phone number will be used for prospecting purposes,
  • to be able to oppose this use in a simple and free way.

Each message should:

  • specify the identity of the advertiser,
  • propose a simple way to oppose receiving new messages (for example, a non-premium phone number where it is possible to unsubscribe at the end of the message). 
  • In case of marketing purposes the opt-out must be well documented, users can opt out by sms, email, sending a form, contacting brand. There must be always a way out and it must be documented.

Mexico Short Code Opt-Out Requirements 

Opt-outs must be handled by the customer. Opt-in process is not regulated, but must be very well documented on the customer side in Terms and Conditions.

In case of any user complaints to carriers, we need to demonstrate that the Opt-Out process is documented and provide the evidence and also methods on how customers can opt-out.


Carriers No longer Supported

Mexico 334 130 - Axtel (ALESTRA SERVICIOS MÓVILES, S.A. DE C.V.) is not supported and that messages sent to it will be delivered with a shared short code

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