One possible version：

People used to communicate with each other through letters and public phones 。But nowadays they use mobile phones and the Internet instead 。This change in communication has good effects on our life and work 。Compared with letters and public phones ，mobile phones and the Internet are faster and much more convenient 。If you miss your grandmother ，you just take out your phone and say

“hello ”to her。If you want to place an order with a foreign company，you can e-mail the message 。It'll be a master of minutes before you get their reply 。Aren't we living in a smaller world？