SMS code does not come, what should I do?

Question

Android

I have an app, I am using firebase. For the test, I added my number and code, when dialing my code, I successfully log in. But as soon as I enter another number and click on "send" nothing happens. Help me please.
EditText editTextPhone, editTextCode;
FirebaseAuth mAuth;
String codeSent;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mAuth = FirebaseAuth.getInstance();
editTextCode = findViewById(R.id.editTextCode);
editTextPhone = findViewById(R.id.editTextPhone);
findViewById(R.id.buttonGetVerificationCode).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
sendVerificationCode();
}
});
findViewById(R.id.buttonSignIn).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
verifySignInCode();
}
});
}
private void verifySignInCode(){
String code = editTextCode.getText().toString();
PhoneAuthCredential credential = PhoneAuthProvider.getCredential(codeSent, code);
signInWithPhoneAuthCredential(credential);
}
private void signInWithPhoneAuthCredential(PhoneAuthCredential credential) {
mAuth.signInWithCredential(credential)
.addOnCompleteListener(this, new OnCompleteListener() {
@Override
public void onComplete(@NonNull Task task) {
if (task.isSuccessful()) {
//here you can open new activity
Toast.makeText(getApplicationContext(),
"Login Successful", Toast.LENGTH_LONG).show();
} else {
if (task.getException() instanceof FirebaseAuthInvalidCredentialsException) {
Toast.makeText(getApplicationContext(),
"Invalid Verification Code", Toast.LENGTH_LONG).show();
}
}
}
});
}
private void sendVerificationCode(){
String phone = editTextPhone.getText().toString();
if(phone.isEmpty()){
editTextPhone.setError("Phone number is required");
editTextPhone.requestFocus();
return;
}
if(phone.length() < 10 ){
editTextPhone.setError("Please enter a valid phone");
editTextPhone.requestFocus();
return;
}
PhoneAuthProvider.getInstance().verifyPhoneNumber(
phone, // Phone number to verify
60, // Timeout duration
TimeUnit.SECONDS, // Unit of timeout
this, // Activity (for callback binding)
mCallbacks); // OnVerificationStateChangedCallbacks
}
PhoneAuthProvider.OnVerificationStateChangedCallbacks mCallbacks = new PhoneAuthProvider.OnVerificationStateChangedCallbacks() {
@Override
public void onVerificationCompleted(PhoneAuthCredential phoneAuthCredential) {
}
@Override
public void onVerificationFailed(FirebaseException e) {
}
@Override
public void onCodeSent(String s, PhoneAuthProvider.ForceResendingToken forceResendingToken) {
super.onCodeSent(s, forceResendingToken);
codeSent = s;
}
};
}