Why do phones have a dial tone?

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Tags

  1. #phones
  2. #phone
  3. #functional
  4. #means
  5. #purpose
  6. #ready
  7. #every
  8. #delivering
  9. #course
  10. #enterprise
  11. #receive
  12. #begins
  13. #indicate
  14. #context
  15. #calls
  16. #stops