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

# Sending SMS

> Compose, attach, and send SMS to one or many recipients.

You can send SMS from three places:

* **Compose modal** in the Inbox (open the channel picker and choose an SMS channel).
* **Record detail**: the conversation panel shows an SMS action when the record has a recognised phone property.
* **Workflow / Sequence**: a "send SMS" action sends to a recipient resolved from the linked record.

## Selecting a channel

If you have access to more than one SMS channel, the compose modal asks which number to send from. Personal channels show first; shared channels are grouped below.

## MMS

To attach an image or video, use the paperclip icon. Files larger than the carrier MMS limit are sent as a hosted link instead.

## Templates

SMS templates live alongside email templates and reuse the same personalisation tokens.

## Failures

If Twilio rejects the send (invalid number, opt-out, blocked), the failure is recorded on the Conversation timeline with the Twilio error code. The number is added to the suppression list automatically when the failure indicates a permanent block. See [Suppressions](/comms/suppressions/overview).


## Related topics

- [SMS](/comms/sms/overview.md)
- [A2P 10DLC Registration](/comms/sms/a2p-registration.md)
- [Troubleshooting](/comms/sms/troubleshooting.md)
- [Sending Pools](/comms/voice/pools.md)
- [Phone & SMS Numbers](/comms/voice/numbers.md)