Smartphone have many advantage. First, you can use smartphone to search something easily. In addition, you don't have to meet for talking other people by call or send messages. Second, "Line" can send messages faster than sending messages. However, smartphones also have some disadvantage. First, if you use too much smartphone, you will lose sight and you will lose most of the time with a smartphone. Despite these disadvantage, many people think that use smartphones, it is easy for search and communication