在Firebase Phone身份验证中有些手机未接收OTP？

Question

我使用Firebase手机验证，因为有些手机没有收到OTP验证手机号码。对于集成Firebase Phone身份验证，我只需遵循Firebase文档。是否有任何限制，例如仅适用于高级API，而不适用于较低的API。

这是我的Java代码

PhoneAuthProvider.OnVerificationStateChangedCallbacks mCallbacks;
FirebaseAuth mAuth;

mAuth = FirebaseAuth.getInstance();
mCallbacks = new PhoneAuthProvider.OnVerificationStateChangedCallbacks() {

        @Override
        public void onVerificationCompleted(PhoneAuthCredential credential) {

            signInWithPhoneAuthCredential(credential);

        }

        @Override
        public void onVerificationFailed(FirebaseException e) {

            mVerificationInProgress = false;

            if (e instanceof FirebaseAuthInvalidCredentialsException) {

                toast("Invalid Phone Number");
                finish();
                Intent intent = new Intent(MobileNoVerification.this, Login.class);
                startActivity(intent);

            } else if (e instanceof FirebaseTooManyRequestsException) {

                toast("Quota exceeded.");

            }
        }

        @Override
        public void onCodeSent(String verificationId, PhoneAuthProvider.ForceResendingToken token) {

            mVerificationId = verificationId;
            mResendToken = token;

        }
    };


private void startPhoneNumberVerification(String phoneNumber) {

    mAuth.signOut();

    PhoneAuthProvider.getInstance().verifyPhoneNumber(
            phoneNumber,
            60,
            TimeUnit.SECONDS,
            this,
            mCallbacks);

    mVerificationInProgress = true;
}

在 onStart（）

中调用此 startPhoneNumberVerificatio 方法

private void verifyPhoneNumberWithCode(String verificationId, String code) {

    PhoneAuthCredential credential = PhoneAuthProvider.getCredential(verificationId, code);

    signInWithPhoneAuthCredential(credential);

}

private void signInWithPhoneAuthCredential(PhoneAuthCredential credential) {

    mAuth.signInWithCredential(credential).addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
        @Override
        public void onComplete(@NonNull Task<AuthResult> task) {
            if (task.isSuccessful()) {

            } else {

                if (task.getException() instanceof FirebaseAuthInvalidCredentialsException) {
                    error_dialog("Invalid Code!");
                }

            }
        }
    });
}

我的编码中有什么问题，指导我以更好的方式做到这一点。