While original transistor radios only received voice and music, current two-way radios often include text capabilities:
sending short text messages over analog audio using handheld radios transistor radio
Apps like Rattlegram or Ribbit allow you to send text by holding your phone near a standard radio's microphone. The app converts text into a series of audio "beeps" (digital noise) that another radio can receive and decode back into text. While original transistor radios only received voice and