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• Radiotelephone - Wikipedia
  A radiotelephone (or radiophone), abbreviated RT, is a radio communication system for conducting a conversation; radiotelephony means telephony by radio.
  https://en.wikipedia.org/wiki/Radiotelephone
• Description for 4812: Radiotelephone Communications - OSHA
  Establishments primarily engaged in providing two-way radiotelephone communications services, such as cellular telephone services.
  http://www.osha.gov/sic-manual/4812
• Rural Radiotelephone Service | Federal Communications Commission
  Rural Radiotelephone spectrum is used to provide basic, analog, telephone service to subscribers in locations deemed so remote that traditional wireline ...
  https://www.fcc.gov/wireless/bureau-divisions/mobility-division/rural-radiotelephone-service
• Section 2. Radio Communications Phraseology and Techniques - FAA
  Radio communications are a critical link in the ATC system. · The single, most important thought in pilot‐controller communications is understanding. · All pilots ...
  https://www.faa.gov/air_traffic/publications/atpubs/aim_html/chap4_section_2.html