Telephony.SMS_RECEIVED filter invoked selectively

Question

I need to read text from incoming SMS and, as from title, I'm facing a strange behaviour: filter is correctly invoked when testing in android emulator and, on real phone, when using an SMS web service but not if SMS comes from another phone; below my code.

MANIFEST

<uses-permission android:name="android.permission.READ_SMS" />
<uses-permission android:name="android.permission.RECEIVE_SMS" />
<uses-permission android:name="android.permission.SEND_SMS" />

Of course permission is granted for all of them.

BROADCAST RECEIVER

public class SmsNotificationReceiver extends BroadcastReceiver {
    private static final String TAG = "[SmsNotificationReceiver]";

    public SmsNotificationReceiver() {}

    @Override
    public void onReceive(Context context, @NonNull Intent intent) {
        String action = intent.getAction();

        if (TextUtils.isEmpty(action)) { return; }

        Log.i(TAG, "Action: " + action);
    }
}

RECEIVER REGISTRATION

IntentFilter filter = new IntentFilter();
filter.addAction("android.provider.Telephony.SMS_RECEIVED");
filter.setPriority(IntentFilter.SYSTEM_HIGH_PRIORITY);
BroadcastReceiver smsReceiver = new SmsNotificationReceiver();
registerReceiver(smsReceiver, filter);

Anything wrong I'm doing here? Does anyone met similar behaviour and solved it? If so please kindly address me to recognize what's wrong? Thanks