[Home](./index.md) > [@firebase/auth](./auth.md) > [UserInfo](./auth.userinfo.md) > [phoneNumber](./auth.userinfo.phonenumber.md) ## UserInfo.phoneNumber property The phone number normalized based on the E.164 standard (e.g. +16505550101) for the user. Signature: ```typescript readonly phoneNumber: string | null; ``` ## Remarks This is null if the user has no phone credential linked to the account.