The Soviet smart phone weighs six pounds. You talk in to a handset attached by a cable. It has terrible call quality but gets reception anywhere on earth. If you open it up you'll find a replaceable wet cell battery, a complete circuit diagram, spare fuses, and a worrying sealed box with a nuclear trefoil on it. All parts are replaceable by hand. It has 70% parts compatibility with your microwave, your radio, and your lada.