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

# Content

> Choose your SMS template, map variables, test your message, and configure UTM tracking.

The Content step is where you define what your SMS will say. This includes selecting a template, mapping dynamic variables, sending a test, and setting up UTM parameters for link tracking.

## 1. Select a template

Click **Choose template** to pick a **published/live** [SMS template](/platform/create_sms_template), or **Create SMS template** to open the template builder in a new tab.

<Frame caption="SMS campaign — Content step and template picker">
  <img src="https://mintcdn.com/co-d33c95f1/JDH1bOmW9sqfInn6/images/campaign-sms-content.png?fit=max&auto=format&n=JDH1bOmW9sqfInn6&q=85&s=1490be2e55aecb0d00f94be69e2f091d" alt="SMS campaign content step" width="1556" height="784" data-path="images/campaign-sms-content.png" />
</Frame>

## 2. Variable mapping

Once a template is selected, every variable it contains (e.g. `{{phone}}`, `{{first_name}}`) is listed in a **Variable mapping** table with a **Map to field** dropdown — populated from your attached audience's columns — and a **Fallback** value.

| Column           | Description                                                         |
| ---------------- | ------------------------------------------------------------------- |
| **Variable**     | The placeholder used in the template                                |
| **Map to field** | The audience column whose value replaces this variable at send time |
| **Fallback**     | The value used if the mapped column is empty for a contact          |
| **Status**       | **Unset** until a fallback is entered, then **Mapped**              |

<Warning>
  For SMS, **every variable needs a fallback value**. It's used for the test send, and on a real send whenever the mapped column is empty for a contact. You can't continue until all variables show a **Mapped** status.
</Warning>

## 3. Message preview & test

The **Message preview** panel on the right renders the template with your mapped values, as a real SMS bubble. Click **Send test** to send a real test message using your fallback values.

<Frame caption="SMS campaign — live preview and Send test">
  <img src="https://mintcdn.com/co-d33c95f1/JDH1bOmW9sqfInn6/images/campaign-sms-preview.png?fit=max&auto=format&n=JDH1bOmW9sqfInn6&q=85&s=db0938f7ebe47648130ca7f7c43f9cdf" alt="SMS campaign message preview" width="1556" height="784" data-path="images/campaign-sms-preview.png" />
</Frame>

<Tip>
  Test messages are sent immediately, regardless of your campaign's scheduled send time. Use them to catch truncation or broken links before sending to your full audience.
</Tip>

## 4. UTM tracking

UTM tracking is enabled by default. Scroll down to review or edit the parameters appended to any links in your message.

| Parameter                     | Description                             | Default            |
| ----------------------------- | --------------------------------------- | ------------------ |
| **Source** (`utm_source`)     | Identifies the traffic source           | `comify`           |
| **Medium** (`utm_medium`)     | The marketing medium                    | `sms`              |
| **Campaign** (`utm_campaign`) | The specific campaign name              | Your campaign name |
| **Content** (`utm_content`)   | Differentiates links within the message | Template name      |
| **ID** (`utm_id`)             | Unique campaign identifier              | Auto-generated     |
| **Term** (`utm_term`)         | Keyword term (optional)                 | Off by default     |

Each parameter is individually toggleable, and an example tagged link is shown at the bottom so you can verify the full URL before sending.

## Next step

Once your template is selected, every variable shows **Mapped**, and UTM tags look right, click **Continue** to move to [Scheduling](/campaigns/sms/scheduling).