> For the complete documentation index, see [llms.txt](https://guides.clickatell.com/sms-channel/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guides.clickatell.com/sms-channel/long-numbers.md).

# Long numbers

You require a dedicated number to receive replies to messages you send (i.e., [2-way communication](/sms-channel/2-way-sms-communication.md)). You can choose between using a [long number](#what-is-a-long-number) or a [short code](/sms-channel/short-codes.md). 

## What is a long number?

* Can be up to 16 digits in length. 
* Ideal if you want to receive replies but it's not important that people easily remember your number (e.g., marketing campaigns, competitions, booking confirmations, and customer surveys).
* Allows your business to receive replies from local and international destinations.
* Less expensive than [short codes](/sms-channel/short-codes.md).

{% hint style="info" %}
All **US long numbers** must be registered on the [**10DLC**](/sms-channel/10dlc-regulations-us/what-is-10dlc.md) environment based on new regulations by The Campaign Registry. 

Clickatell can assist you in registering a brand and campaign for your US long numbers. **This is only required for US long numbers**.

Refer to [these FAQs](https://www.clickatell.com/help-center/sms/10dlc-us-long-numbers) for more details on 10DLC and why it was introduced. 
{% endhint %}

## Purchase a long number (self-serve)

{% hint style="info" %}
Only relevant to self-serve clients. For other packages, Clickatell does this on your behalf.
{% endhint %}

{% hint style="success" %}
Ensure your [billing details](https://clickatell.gitbook.io/chat-commerce-platform/account-management/billing-and-payments/billing-details) have been set up before purchasing a long number.
{% endhint %}

1. Go to *My Workspace -> Long Numbers & Short Codes ->* *Get Long Number.*
   * Alternatively, navigate to *My Workspace --> SMS* and click the *Get Long Number* button under *My SMS Numbers*.

<figure><img src="/files/xQda57pC7oRsBOuPa2Uc" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/0VABTnxMhawK0ilaSvYa" alt=""><figcaption></figcaption></figure>

2. Complete the application wizard presented to you.&#x20;
3. You can select multiple numbers per country. Use the *+ Add Number* button to add numbers for multiple countries.&#x20;

<figure><img src="/files/bV75YS95SRYUva5A1RqO" alt=""><figcaption></figcaption></figure>

4. Select a subscription package and payment method.&#x20;
5. Use the toggle to enable auto-renewal (i.e., your subscription will automatically renew at the end of each subscription period). &#x20;

{% hint style="warning" %}
The auto-renewal option is only available if you've specifically given permission when you [added the payment method](https://clickatell.gitbook.io/chat-commerce-platform/account-management/billing-and-payments/payment-methods).
{% endhint %}

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

6. Download a pro forma invoice as a PDF document (optional).
7. Click *Purchase* to confirm the purchase.

<figure><img src="/files/6yep1UlhIVUeTu22yNrd" alt=""><figcaption></figcaption></figure>

{% hint style="success" %}
The new long number now appears in your [*Long numbers & Short codes*](/sms-channel/getting-started/add-and-edit-sms-numbers.md) table and can be linked to an SMS setup.
{% endhint %}