signUp method
Implementation
@override
Future<UserCredential> signUp() async {
throw PlatformException(
code: "UNSUPPORTED_FUNCTION",
message: "Phone Signin does not need sign up.");
}
@override
Future<UserCredential> signUp() async {
throw PlatformException(
code: "UNSUPPORTED_FUNCTION",
message: "Phone Signin does not need sign up.");
}