[Home](./index.md) > [@firebase/auth](./auth.md) > [PhoneAuthProvider](./auth.phoneauthprovider.md)
## PhoneAuthProvider class
Provider for generating an [PhoneAuthCredential](./auth.phoneauthcredential.md).
Signature:
```typescript
export declare class PhoneAuthProvider
```
## Example
```javascript
// 'recaptcha-container' is the ID of an element in the DOM.
const applicationVerifier = new RecaptchaVerifier('recaptcha-container');
const provider = new PhoneAuthProvider(auth);
const verificationId = await provider.verifyPhoneNumber('+16505550101', applicationVerifier);
// Obtain the verificationCode from the user.
const phoneCredential = PhoneAuthProvider.credential(verificationId, verificationCode);
const userCredential = await signInWithCredential(auth, phoneCredential);
```
## Constructors
| Constructor | Modifiers | Description |
| --- | --- | --- |
| [(constructor)(auth)](./auth.phoneauthprovider._constructor_.md) | | Constructs a new instance of the PhoneAuthProvider class |
## Properties
| Property | Modifiers | Type | Description |
| --- | --- | --- | --- |
| [PHONE\_SIGN\_IN\_METHOD](./auth.phoneauthprovider.phone_sign_in_method.md) | static | (not declared) | Always set to [SignInMethod.PHONE](./auth.signinmethod.phone.md). |
| [PROVIDER\_ID](./auth.phoneauthprovider.provider_id.md) | static | (not declared) | Always set to [ProviderId.PHONE](./auth.providerid.phone.md). |
| [providerId](./auth.phoneauthprovider.providerid.md) | | (not declared) | Always set to [ProviderId.PHONE](./auth.providerid.phone.md). |
## Methods
| Method | Modifiers | Description |
| --- | --- | --- |
| [credential(verificationId, verificationCode)](./auth.phoneauthprovider.credential.md) | static | Creates a phone auth credential, given the verification ID from [PhoneAuthProvider.verifyPhoneNumber()](./auth.phoneauthprovider.verifyphonenumber.md) and the code that was sent to the user's mobile device. |
| [credentialFromError(error)](./auth.phoneauthprovider.credentialfromerror.md) | static | Returns an [AuthCredential](./auth.authcredential.md) when passed an error. |
| [credentialFromResult(userCredential)](./auth.phoneauthprovider.credentialfromresult.md) | static | Generates an [AuthCredential](./auth.authcredential.md) from a [UserCredential](./auth.usercredential.md). |
| [verifyPhoneNumber(phoneOptions, applicationVerifier)](./auth.phoneauthprovider.verifyphonenumber.md) | | Starts a phone number authentication flow by sending a verification code to the given phone number. |