Before revision: thumbnail|300px|The smartphone – one of the most important means of communication of the 21st century With the help of a means of communication , people can communicate and exchange information with each other as an information sender and an information recipient.
After revision: thumbnail|300px|The smartphone – one of the most important means of communication of the 21st century Means of communication are used by people to communicate and exchange information with each other as an information sender and an information recipient.