public void SendVerificationCode(string numeroCelular, PhoneValidationActivity Instance)
{
InitializeFirebase();
PhoneVerificationCallback phoneAuthCallbacks = new PhoneVerificationCallback(Instance);
auth = GetFirebaseAuth();
PhoneAuthProvider.GetInstance(auth).VerifyPhoneNumber(numeroCelular, 30, TimeUnit.Seconds, Instance, phoneAuthCallbacks);
}
public PhoneVerificationCallback(PhoneValidationActivity Instance)
{
_instance = Instance;
}