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[Home](./index.md) > [@firebase/auth](./auth.md) > [PhoneSingleFactorInfoOptions](./auth.phonesinglefactorinfooptions.md)
## PhoneSingleFactorInfoOptions interface
Options used for single-factor sign-in.
<b>Signature:</b>
```typescript
export interface PhoneSingleFactorInfoOptions
```
## Properties
| Property | Type | Description |
| --- | --- | --- |
| [phoneNumber](./auth.phonesinglefactorinfooptions.phonenumber.md) | string | Phone number to send a verification code to. |