@Override
 public Boolean modifyPhoneNumber(
     String phoneNumber, String newPhoneNumber, String firstName, String lastName) {
   return phoneNumberManager.modifyPhoneNumber(phoneNumber, newPhoneNumber, firstName, lastName);
 }
 @Override
 public List<PhoneNumberBean> searchPhoneNumber(String firstName, String lastName) {
   return phoneNumberManager.searchPhoneNumber(firstName, lastName);
 }
 @Override
 public List<PhoneNumberBean> viewAllPhoneNumber() {
   return phoneNumberManager.viewAllPhoneNumber();
 }
 @Override
 public Boolean deletePhoneNumber(String phoneNumber, String firstName, String lastName) {
   return phoneNumberManager.deletePhoneNumber(phoneNumber, firstName, lastName);
 }
 @Override
 public void addPhoneNumber(String phoneNumber, String firstName, String lastName) {
   phoneNumberManager.addPhoneNumber(phoneNumber, firstName, lastName);
 }