Firebase Docs Reference FirebaseAuth Framework Reference FIRPhoneAuthCredential @interface FIRPhoneAuthCredential : FIRAuthCredential Implementation of FIRAuthCredential for Phone Auth credentials. -init This class is not supposed to be instantiated directly. Declaration Objective-C - (nonnull instancetype)init; Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 3.0 License, and code samples are licensed under the Apache 2.0 License. For details, see our Site Policies. Java is a registered trademark of Oracle and/or its affiliates. Last updated May 21, 2018.