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If you ask me, if what is the greatest technology man has ever made and is useful for communication? My answer would be cellular phone, it has really help mankind in bridging long distances and indeed it brought lives together. It helps us to be in touch with our friends, loved ones, a boss or co-worker, family member and relative who are abroad. It is an invention that plays a vital role in our society. It makes our communication easy and accessible, even if you are in the different parts of the world every people uses cellular phone as part of their day to day life.