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