[Home](./index.md) > [@firebase/auth](./auth.md) > [ConfirmationResult](./auth.confirmationresult.md) > [confirm](./auth.confirmationresult.confirm.md) ## ConfirmationResult.confirm() method Finishes a phone number sign-in, link, or reauthentication. Signature: ```typescript confirm(verificationCode: string): Promise; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | verificationCode | string | The code that was sent to the user's mobile device. | Returns: Promise<[UserCredential](./auth.usercredential.md)> ## Example ```javascript const confirmationResult = await signInWithPhoneNumber(auth, phoneNumber, applicationVerifier); // Obtain verificationCode from the user. const userCredential = await confirmationResult.confirm(verificationCode); ```