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

# Send SMS

> Send a text message to a contact from a workflow.

The Send SMS action sends an SMS to the contact using your connected phone number.

## Configuration

| Field            | Required | Description                                                  |
| ---------------- | -------- | ------------------------------------------------------------ |
| **To**           | Yes      | Recipient phone number. Defaults to `{phone_number}`         |
| **Message body** | Yes      | The text to send. Supports variables via the variable picker |

<Tip>
  Keep messages under 160 characters to avoid carrier splitting. Variable values count toward the limit at their resolved length.
</Tip>

## Variable support

Use the variable picker in the message body to insert dynamic values. Examples:

* `Hi {first_name}, here's your booking link: ...`
* `Call summary: {summary}`
* `Your appointment is confirmed for {appointment.start_time}`

See [Variables](/workflows/variables) for the full list.

## Use case

An End of Call trigger fires when a call ends with a voicemail outcome. The Send SMS action sends: "Hi {first_name}, we tried to reach you. Reply here or book a time: \[link]." The contact gets a personal follow-up without any manual work.

## Next steps

<Card title="Variables" icon="code" href="/workflows/variables">
  See every variable available for SMS message bodies.
</Card>