The subclass of the [MultiFactorInfo](https://firebase.google.com/docs/reference/js/auth.multifactorinfo#multifactorinfo_interface) interface for phone number second factors. The `factorId` of this second factor is [FactorId](https://firebase.google.com/docs/reference/js/auth#factorid).PHONE.

**Signature:**

    export interface PhoneMultiFactorInfo extends MultiFactorInfo 

**Extends:** [MultiFactorInfo](https://firebase.google.com/docs/reference/js/auth.multifactorinfo#multifactorinfo_interface)

## Properties

| Property | Type | Description |
|---|---|---|
| [phoneNumber](https://firebase.google.com/docs/reference/js/auth.phonemultifactorinfo#phonemultifactorinfophonenumber) | string | The phone number associated with the current second factor. |

## PhoneMultiFactorInfo.phoneNumber

The phone number associated with the current second factor.

**Signature:**

    readonly phoneNumber: string;