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Monorepo for the Firebase JavaScript SDK
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[Home](./index.md) > [@firebase/auth](./auth.md) > [PhoneMultiFactorAssertion](./auth.phonemultifactorassertion.md)
## PhoneMultiFactorAssertion interface
The class for asserting ownership of a phone second factor. Provided by [PhoneMultiFactorGenerator.assertion()](./auth.phonemultifactorgenerator.assertion.md)<!-- -->.
<b>Signature:</b>
```typescript
export interface PhoneMultiFactorAssertion extends MultiFactorAssertion
```
<b>Extends:</b> [MultiFactorAssertion](./auth.multifactorassertion.md)