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

# SMS Opt-In Methods

> Choose how contacts confirm consent to receive SMS from your displays.

Privy supports two SMS opt-in methods on any display that collects a phone number: **Double Opt-In** and **Single Opt-In**. The method is set per display in **Advanced Settings**, and applies to contacts who sign up on that display.

## Double Opt-In

After submitting the display, the contact receives a text asking them to confirm. They must reply **Y** to that message to become a textable contact on your list. If they don't reply, they remain on your list but are not textable.

Double Opt-In is the default for every display that collects phone numbers. [How does Double Opt-In work?](/docs/learn/compliance/understand-sms-consent#how-does-sms-double-opt-in-work)

## Single Opt-In

The contact becomes textable as soon as they submit the display — no reply required. After signup, they automatically receive a confirmation text letting them know they're subscribed; this message includes the standard STOP and HELP language required for SMS marketing.

Single Opt-In is available in the United States and Canada (+1) on the same SMS setup you already have in place. There are no additional toll-free verification or carrier requirements beyond what's required for any SMS sending on Privy.

## Set the SMS Opt-In method on a Display

The SMS Opt-In card only appears on displays that include a phone number field.

1. Head to [Displays](https://dashboard.privy.com/displays) and open the display you want to edit.
2. Open the **Settings** step, then click **Show Advanced Settings**.
3. In the **SMS Opt-In** card, choose **Single Opt-In** or **Double Opt-In**. The preview updates to show the confirmation message your contacts will receive in the selected method.
4. **Save** your display.

The setting is per display, so different displays on the same account can use different methods.

<video autoPlay muted loop playsInline className="sms-opt-in-setting" src="https://mintcdn.com/privy/zaj-Tx4C3xyYbxMy/new-images/contacts/smsoptinsetting.mp4?fit=max&auto=format&n=zaj-Tx4C3xyYbxMy&q=85&s=4463c21f5ae3cfd1441859694d90c2d9" data-path="new-images/contacts/smsoptinsetting.mp4" />

## FAQ

<AccordionGroup>
  <Accordion title="Does Single Opt-In work on multi-step displays?" icon="circle-question">
    Yes. The setting is available on any display type that collects a phone number, including single-step and multi-step displays.
  </Accordion>

  <Accordion title="Why don't I see the SMS Opt-In card on my display?" icon="circle-question">
    The card is hidden on displays that don't collect a phone number. Add a phone number field from the form fields panel and the **SMS Opt-In** card will appear in Advanced Settings.
  </Accordion>
</AccordionGroup>