code: public static ResourceList<AvailableNumber> list(final int page, final int size) throws IOException {
      	        
          return list(BandwidthClient.getInstance(), page, size);
      }
docs: Factory method for AvailableNumber list, returns list of AvailableNumber objects with page, size preferences
  @param page the page
  @param size the page size
  @return the list
  @throws IOException unexpected error.