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ZIMSEC O Level Commerce Notes: Communication: Telephone


  • Rented from Tel One.
  • Allows dialogue between the parties involved.
  • Replies are immediate if the person is present to receive the phone call.
  • Calls can be dialed directly using STD.
  • Calls can be made locally or internationally.
  • Subscribers are allocated unique numbers.
  • Subscriber’s numbers are listed in the telephone directories.
  • Offers a variety of services e.g. free phone, time call and reverse charge calls.
  • Is fast in sending and receiving messages.
  • Can be used with an answering machine.


  • There is no written record of conversations.
  • Information may be wrongly interpreted.
  • There is no privacy.

To access more topics go to the Commerce Notes page.