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

# Send SMS

> Send text messages to callers or alternate numbers during a live call.

## Overview

The Send SMS tool lets your agent transmit text messages mid-call — useful for sending confirmation links, appointment details, or follow-up information without ending the conversation.

<Note>
  This feature requires a phone number with SMS enabled, or a UponAI SMS-approved number.
</Note>

***

## Sending Options

<CardGroup cols={2}>
  <Card title="UponAI SMS-approved numbers" icon="check-circle">
    Pre-approved for immediate use. Message content uses a preset template — no customization allowed.
  </Card>

  <Card title="Agent's associated number" icon="sliders">
    Requires A2P application approval. Allows fully flexible message content via prompts or static text with dynamic variables.
  </Card>
</CardGroup>

***

## Message Configuration

When using your agent's number, you can configure:

* **Dynamic content**: Use a prompt so the LLM generates the message based on conversation context
* **Static content**: Set a fixed message with dynamic variables like `{{customer_name}}` or `{{appointment_time}}`

***

## Recipient

By default, the SMS goes to the caller's number. You can also route to an alternate number using:

* A static value (e.g. `+14158923245`)
* A dynamic variable (e.g. `{{customer_phone}}`)

***

## Companion Settings

| Setting             | Description                                       |
| ------------------- | ------------------------------------------------- |
| Talk while waiting  | Agent speaks while the message is being sent      |
| Speak after sending | Agent confirms delivery or continues conversation |

***

<Frame>
  <img src="https://mintcdn.com/uponai/7QzWw_-VPReC-RSK/images/screenshots/image9.png?fit=max&auto=format&n=7QzWw_-VPReC-RSK&q=85&s=f02834f876d4e05b9cbfa265cae92eb4" alt="SMS Notifications panel showing sender number, recipient, content fields, and custom dynamic variable fields" width="198" height="766" data-path="images/screenshots/image9.png" />
</Frame>

## Inbound SMS

Agents can also receive inbound SMS during calls. Supported content types (on compatible numbers): text, images, audio, and video.