Method to return contacts phone number always returns null - Android

Question

Please help! I cannot figure out why this method is never returning a phone number. I understand that some contacts may not have a phone number, but it is always, always returning null. I am feeding the method a contact Id that I retrieved earlier.

    private String retrieveContactNumber(String id) {


    String contactNumber = "not set, null";

    Log.d(TAG, "Contact ID: " + id);

    Cursor cursorPhone = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
            new String[]{ContactsContract.CommonDataKinds.Phone.NUMBER},

            ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = ? AND " +
                    ContactsContract.CommonDataKinds.Phone.TYPE + " = " +
                    ContactsContract.CommonDataKinds.Phone.TYPE_MOBILE,

            new String[]{id},
            null);

    if (cursorPhone.moveToFirst()) {
        contactNumber = cursorPhone.getString(cursorPhone.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
    }

    cursorPhone.close();

    Log.d(TAG, "Contact Phone Number: " + contactNumber);

    return contactNumber;
}