 Although radio and television programs do travel outside national borders, in many cases reception by foreigners is accidental.However, for purposes of propaganda, transmitting religious beliefs, keeping in touch with colonies or expatriates, education, improving trade, increasing national prestige, or promoting tourism and goodwill, broadcasting services have operated external services since the 1920s.International broadcasting, in a limited extent, began during World War I, when German and British stations broadcast press communiqués using Morse code.