> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ownid.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Introduction
> Send phone verification SMS messages through Twilio or your SMS provider and configure SMS templates.
OwnID can send an OTP by SMS when phone verification is part of the user journey, such as first-time enrollment of a device or when biometric verification is not available.
To use SMS verification, configure your app's login identifier as a phone number and set up an SMS delivery provider. You can use Twilio or route SMS messages through your own provider endpoint.
## Enable phone number as the login identifier
Configure phone-based login for each OwnID app that should send verification codes by SMS:
1. Log into the [Console](https://console.ownid.com/home) and select the App that you want to configure.
2. Click **User journey** from the left navigation panel.
3. In the **Login identifier** section, select **Phone number**.
4. Click **Customize list of countries** to limit which phone number country codes are available to users, if needed.
1. Click **Save Changes**.
## Select your SMS configuration
After phone number login is enabled, scroll to **OTP configuration**, select **SMS** as the delivery channel, and choose how OwnID should send verification messages.
Enter your Twilio credentials in the OwnID console.
Build an endpoint to integrate with your custom SMS provider.
Personalize OTP SMS messages for supported locales.