voluptasmollitia
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Monorepo for the Firebase JavaScript SDK
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[Home](./index.md) > [@firebase/auth](./auth.md) > [AuthError](./auth.autherror.md) > [phoneNumber](./auth.autherror.phonenumber.md)
## AuthError.phoneNumber property
The phone number of the user's account, used for sign-in/linking.
<b>Signature:</b>
```typescript
readonly phoneNumber?: string;
```