> ## Documentation Index
> Fetch the complete documentation index at: https://docs.wavix.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Sender ID not found

## Error description

You're trying to send an SMS or MMS using a Sender ID that isn't registered.

## How to fix it

To send SMS or MMS messages, make sure you're using a registered Sender ID.