Various countries and mobile carriers enforce their own rules and restrictions, which can result in Sender IDs being modified or blocked.

Rules and regulations set by individual countries and carriers can cause Sender IDs to be altered or blocked.

Information on this can be found in Global Sender ID Support.

You may also be required to pre‑register your Sender ID before a carrier will deliver your messages.

Some carriers enforce specific Sender ID restrictions; for example, certain carriers block alphanumeric Sender IDs, others only allow numeric Sender IDs, and some replace any custom Sender ID with one of their own.

If you are encountering issues with your Sender IDs, please create a new ticket below and include details such as:

• CLiX Username
• The Sender ID you are attempting to use
• Destination country
• Description of the issue

The method you are sending with (e.g. API, Web platform, or Email to SMS)

Alternatively, you can review the knowledgebase sections on Sender ID or Laws and Regulations for additional guidance to help troubleshoot your Sender ID issues.