[Home](./index.md) > [@firebase/auth](./auth.md) > [PhoneAuthProvider](./auth.phoneauthprovider.md) > [(constructor)](./auth.phoneauthprovider._constructor_.md) ## PhoneAuthProvider.(constructor) Constructs a new instance of the `PhoneAuthProvider` class Signature: ```typescript constructor(auth: Auth); ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | auth | [Auth](./auth.auth.md) | The Firebase Auth instance in which sign-ins should occur. |