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title: Why was my Sender ID rejected? 
description: SMS Global Knowledgebase
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# Why was my Sender ID rejected? 

## Information on why a sender ID may be rejected

 

The most common reason your Sender ID may have been rejected because the Sender ID has already been registered by another user.

Other reasons may include inappropriate or offensive Sender ID names or not adhering to the proper alphanumeric Sender ID requirements.

If you’re using an alphanumeric (custom word) Sender ID, you must ensure that:

- Your sender ID is no longer than 16 digits or 11 alphanumeric characters
- Only (a-z) and (0-9) characters are used
- Any full stops or spaces are removed

Your sender ID is no longer than 16 digits or 11 alphanumeric characters

Only (a-z) and (0-9) characters are used

Any full stops or spaces are removed

**Note:** Some carriers will reject either alphanumeric or numeric Sender IDs. Please try restrict your Sender ID to either numbers or letters (not both) to see if the problem is resolved. Further information available in [Global Sender ID Support](https://hs.smsglobal.com/global-sender-id-support-smsglobal-help-center?hsLang=en-au).

If you need further assistance please create a ticket to our support team at support@smsglobal.com to help troubleshoot this issue.

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