> For the complete documentation index, see [llms.txt](https://help.clickatell.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.clickatell.com/chat-flow/workflow-management/using-the-previewer/preview-flow-on-different-channels.md).

# Preview flow on different channels

## Preview a flow

1. Click the *Preview* button (top left of canvas). 
2. Select the channel you want to preview the flow on.
   * **Note:** You can only select from those channels that have been set up in your account*.*
3. Add the test details for the selected channel.
   * **Note:** For testing purposes, this can be anything and does not have to be a real phone number.
4. Select the flow you want to preview using the *Select Route* drop-down (defaults to the flow currently in context).  

<figure><img src="/files/KQzQmu7yhgjipTdtzQam" alt=""><figcaption></figcaption></figure>

5. To exit, click the *Stop preview* button (top left of canvas).

<figure><img src="/files/jrXZXSboS1OF6kFwwz0N" alt=""><figcaption></figcaption></figure>

## **Preview on WhatsApp**&#x20;

Previewing the WhatsApp channel offers a rich experience, including media, location sharing, etc.

1. Click *Start*.&#x20;
2. Type something in the text box and press *Enter* to trigger your flow.
3. There is an option to test your flow simulating [BSUID](https://help.clickatell.com/whatsapp/getting-started/initiate-whatsapp-conversations#usernames-and-business-scoped-user-ids). If you select this option, the "Mobile Number" field relabels to BSUID with placeholder "Enter a BSUID". Type a fake BSUID value (e.g. ZA 1234567890) into the field.
   * The emulator treats this as a BSUID-only message (no phone number in the webhook).
   * The Trigger Contact Book Flow check box will only be visible to users who have the [Contact Book](/chat-flow/action-nodes/contact-book.md) feature enabled.

<figure><img src="/files/vL6R4SpQr8DeeQXCdHFK" alt=""><figcaption></figcaption></figure>

![](/files/hIJl6tFzBINxeFwQ77uu)

![](/files/eVshUldaZIgJkD9jk6kq)

## **Preview on SMS**&#x20;

The SMS channel preview provides a simpler, text-only experience including a character count so flow-builders can correctly structure their messages.

![](/files/4lMUOsZXRJ4Ewyrf0reJ)

![](/files/VYOQmRHHHpcNSBVVQXe5)

## **Preview on USSD**&#x20;

The USSD channel preview provides a similar experience to SMS, with shorter, text-only message&#x73;**.**

<figure><img src="/files/J6GEbOnhA9vhilay9v66" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/j70T6cj6NaAQFB4WIuTP" alt=""><figcaption></figcaption></figure>


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