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

# Send via SMS

> Send via SMS using the Stytch Next.js SDK

Wraps the [send](/api-reference/consumer/api/otp/via-sms/send) via SMS API endpoint. Call this method to send an SMS passcode to existing users. This method is also used when you need to add a phone number to an existing Stytch User. If there is a currently valid Stytch session, and the user inputs a phone number that does not match one on their Stytch User object, upon successful authentication the new phone number will be added to the existing user. Note, this does expose a potential account enumeration vector, see our article on [preventing account enumeration](/resources/policies/platform/account-enumeration) for more details.

<Note>
  Before configuring SMS or WhatsApp OTPs, please review how Stytch [bills the costs of international OTPs](https://stytch.com/pricing) and understand how to protect your app against [toll fraud](/resources/policies/messaging/toll-fraud).
</Note>

## Parameters

<ParamField body="phone_number" type="string" required>
  The phone number to use for one-time passcodes. The phone number should be in E.164 format (i.e. +1XXXXXXXXXX). You may use +10000000000 to test this endpoint, see [Sandbox Values](/api-reference/consumer/api/resources/sandbox-values) for more detail.
</ParamField>

<ParamField body="Configuration" type="object">
  Additional configuration.

  <Expandable title="properties">
    <ParamField body="expiration_minutes" type="int">
      Set the expiration for the one-time passcode, in minutes. The minimum expiration is 1 minute and the maximum is 10 minutes. The default expiration is 2 minutes.
    </ParamField>

    <ParamField body="locale" type="string">
      Used to determine which language to use when sending the user this delivery method. Parameter is an [IETF BCP 47 language tag](https://www.w3.org/International/articles/language-tags/), e.g. "en". Supported languages are English ("en"), Spanish ("es"), French ("fr") and Brazilian Portuguese ("pt-br"); if no value is provided, the copy defaults to English.
    </ParamField>

    <ParamField body="enable_autofill" type="boolean">
      Whether or not to append autofill metadata to SMS OTP messages
    </ParamField>

    <ParamField body="autofill_session_duration_minutes" type="number">
      The intended session duration for an autofilled SMS authenticate request
    </ParamField>
  </Expandable>
</ParamField>

## Response

<ResponseField name="method_id" type="string">
  The `email_id` or `phone_id` involved in the given authentication.
</ResponseField>

<ResponseField name="request_id" type="string">
  Globally unique UUID that is returned with every API call. This value is important to log for debugging purposes; we
  may ask for this value to help identify a specific API call when helping you debug an issue.
</ResponseField>

<ResponseField name="status_code" type="number">
  The HTTP status code of the response. Stytch follows standard HTTP response status code patterns, e.g. 2XX values
  equate to success, 3XX values are redirects, 4XX are client errors, and 5XX are server errors.
</ResponseField>

<Panel>
  <RequestExample>
    ```jsx theme={null}
    import { useCallback } from 'react';
    import { useStytch } from '@stytch/nextjs';
    export const Login = () => {
    const stytch = useStytch();
    const sendPasscode = useCallback(() => {
      stytch.otps.sms.send('${examplePhoneNumber}', {
        expiration_minutes: 5,
      });
    }, [stytch]);
    return <button onClick={sendPasscode}>Send passcode</button>;
    };
    ```
  </RequestExample>

  <ResponseExample>
    ```json 200 theme={null}
    {
      "status_code": 200,
      "request_id": "request-id-test-b05c992f-ebdc-489d-a754-c7e70ba13141",
      "method_id": "phone-number-test-d5a3b680-e8a3-40c0-b815-ab79986666d0"
    }
    ```

    ```json 400 theme={null}
    {
      "status_code": 400,
      "request_id": "request-id-test-b05c992f-ebdc-489d-a754-c7e70ba13141",
      "error_type": "invalid_phone_number",
      "error_message": "phone_number format is invalid.",
      "error_url": "https://stytch.com/docs/api/errors/400"
    }
    ```

    ```json 401 theme={null}
    {
      "status_code": 401,
      "request_id": "request-id-test-b05c992f-ebdc-489d-a754-c7e70ba13141",
      "error_type": "unauthorized_credentials",
      "error_message": "Unauthorized credentials.",
      "error_url": "https://stytch.com/docs/api/errors/401"
    }
    ```

    ```json 404 theme={null}
    {
      "status_code": 404,
      "request_id": "request-id-test-b05c992f-ebdc-489d-a754-c7e70ba13141"
      "error_type": "user_not_found",
      "error_message": "User could not be found.",
      "error_url": "https://stytch.com/docs/api/errors/404"
    }
    ```

    ```json 429 theme={null}
    {
      "status_code": 429,
      "request_id": "request-id-test-b05c992f-ebdc-489d-a754-c7e70ba13141",
      "error_type": "too_many_requests",
      "error_message": "Too many requests have been made.",
      "error_url": "https://stytch.com/docs/api/errors/429"
    }
    ```

    ```json 500 theme={null}
    {
      "status_code": 500,
      "request_id": "request-id-test-b05c992f-ebdc-489d-a754-c7e70ba13141",
      "error_type": "internal_server_error",
      "error_message": "Oops, something seems to have gone wrong, please reach out to support@stytch.com to let us know what went wrong.",
      "error_url": "https://stytch.com/docs/api/errors/500"
    }
    ```
  </ResponseExample>
</Panel>