You can add an extra 2GB of data per month onto your free plan for $18 per month, and go from those 200 anytime minutes to unlimited calling for another $10 per month. 2. A modern communications system is first concerned with the collation, processing and storage of information before its transmission . 3. GDI (graphics device interface) technology can cut down the demands on the printer hardware by getting the PC to do the hard work of the printing process, and therefore, since their introduction, laser printers have come down markedly in price.