title: Firebase not sending OTP
body: <p>I had registered a user in <code>firebase</code> using <code>Firebase</code> phone number <code>authentication</code>.For testing that functionality again, I deleted the user account from <code>Firebase</code> console. Now, i am trying to register that number again, its directly going to the <code>onVerificationCompleted()</code> callback without sending the <code>OTP</code>.But the user account is not shown in Firebase console.</p>
  
  <p>Please help.</p>
  
  <p>Code given below. Also please note that its sending OTP to the new numbers .But not sending OTP to the number which i deleted from firebase console.I want to register that particular number again.</p>
  
  <pre><code>public class MainActivity extends AppCompatActivity {
  
  private FirebaseAuth mAuth;
  
  private boolean mVerificationInProgress = false;
  private PhoneAuthProvider.OnVerificationStateChangedCallbacks mCallbacks;
  
  private static final String KEY_VERIFY_IN_PROGRESS = "key_verify_in_progress";
  
  private static final String TAG = "PhoneAuthActivity";
  private String mVerificationId;
  private PhoneAuthProvider.ForceResendingToken mResendToken;
  
  private EditText mPhoneNumberField;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
  
      if (savedInstanceState != null) {
          onRestoreInstanceState(savedInstanceState);
      }
  
      mPhoneNumberField=(EditText)findViewById(R.id.phone_number);
  
      mAuth = FirebaseAuth.getInstance();
  
      mCallbacks = new PhoneAuthProvider.OnVerificationStateChangedCallbacks() {
  
          @Override
          public void onVerificationCompleted(PhoneAuthCredential credential) {
              // This callback will be invoked in two situations:
              // 1 - Instant verification. In some cases the phone number can be instantly
              //     verified without needing to send or enter a verification code.
              // 2 - Auto-retrieval. On some devices Google Play services can automatically
              //     detect the incoming verification SMS and perform verification without
              //     user action.
              Log.d(TAG, "onVerificationCompleted:" + credential);
              Toast.makeText(getApplication(),"Verification completed",Toast.LENGTH_SHORT).show();
              // [START_EXCLUDE silent]
              mVerificationInProgress = false;
  
              Log.d(TAG,"CREDENTIAL"+credential);
  
  //                Intent intent=new 
  Intent(getBaseContext(),VerificationActivity.class);
  //                intent.putExtra("VERIFICATION_ID",mVerificationId);
  //                startActivity(intent);
  
  
          }
  
  
  
  
          @Override
          public void onVerificationFailed(FirebaseException e) {
              // This callback is invoked in an invalid request for verification is made,
              // for instance if the the phone number format is not valid.
              Log.w(TAG, "onVerificationFailed", e);
              // [START_EXCLUDE silent]
              mVerificationInProgress = false;
              // [END_EXCLUDE]
  
              if (e instanceof FirebaseAuthInvalidCredentialsException) {
                  // Invalid request
                  // [START_EXCLUDE]
                  mPhoneNumberField.setError("Invalid phone number.");
                  // [END_EXCLUDE]
              } else if (e instanceof FirebaseTooManyRequestsException) {
                  // The SMS quota for the project has been exceeded
                  // [START_EXCLUDE]
                  Snackbar.make(findViewById(android.R.id.content), "Quota exceeded.",
                          Snackbar.LENGTH_SHORT).show();
                  // [END_EXCLUDE]
              }
  
  
          }
  
          @Override
          public void onCodeSent(String verificationId,
                                 PhoneAuthProvider.ForceResendingToken token) {
              // The SMS verification code has been sent to the provided phone number, we
              // now need to ask the user to enter the code and then construct a credential
              // by combining the code with a verification ID.
              Log.d(TAG, "onCodeSent:" + verificationId);
  
              // Save verification ID and resending token so we can use them later
              mVerificationId = verificationId;
              mResendToken = token;
  
              Intent intent=new Intent(getBaseContext(),VerificationActivity.class);
              intent.putExtra("VERIFICATION_ID",mVerificationId);
              startActivity(intent);
  
  
          }
      };
  }
  
  
  public void verifyDevice(View v){
  
      String phno=mPhoneNumberField.getText().toString();
      startPhoneNumberVerification(phno);
  
  
  }
  
  private void startPhoneNumberVerification(String phoneNumber) {
      // [START start_phone_auth]
      PhoneAuthProvider.getInstance().verifyPhoneNumber(
              phoneNumber,        // Phone number to verify
              60,                 // Timeout duration
              TimeUnit.SECONDS,   // Unit of timeout
              this,               // Activity (for callback binding)
              mCallbacks);        // OnVerificationStateChangedCallbacks
      // [END start_phone_auth]
  
      mVerificationInProgress = true;
  
  
  }
  
  
  @Override
  public void onStart() {
      super.onStart();
  
      if (mVerificationInProgress) {
          startPhoneNumberVerification(mPhoneNumberField.getText().toString());
      }
      // [END_EXCLUDE]
  }
  // [END on_start_check_user]
  
  @Override
  protected void onSaveInstanceState(Bundle outState) {
      super.onSaveInstanceState(outState);
      outState.putBoolean(KEY_VERIFY_IN_PROGRESS, mVerificationInProgress);
  }
  
  @Override
  protected void onRestoreInstanceState(Bundle savedInstanceState) {
      super.onRestoreInstanceState(savedInstanceState);
      mVerificationInProgress = savedInstanceState.getBoolean(KEY_VERIFY_IN_PROGRESS);
  }
  </code></pre>
  
  <p>Looking forward to some help.</p>