Differences of communication system in the past and present?

4/17/2010 By: Insha

In the past there was communication devices that we now do not have. In the past there were such things as smoke signals, telegraphs, carrier pigeons, animal sounds and early telephones. plus letters. In the present we have cell phones, telephones, email addresses, fax machines, and more. so that's the differences of the communication system in the past and today the presents of the 21st centuries.