code: public void serviceName_phonebooks_bookKey_DELETE(String serviceName, String bookKey) throws IOException {
  		String qPath = "/sms/{serviceName}/phonebooks/{bookKey}";
  		StringBuilder sb = path(qPath, serviceName, bookKey);
  		exec(qPath, "DELETE", sb.toString(), null);
  	}
docs: Delete a phonebook
  
  REST: DELETE /sms/{serviceName}/phonebooks/{bookKey}
  @param serviceName [required] The internal name of your SMS offer
  @param bookKey [required] Identifier of the phonebook