Urgent: talk about the reasons for the popularity of mobile phones! !

The popularity of mobile phones began with mobile phones. The use of mobile phones in 1987 seemed to be that the first user was a Hong Kong person. At that time, the mobile phone was a symbol of status and power. It often took a month from opening an account to using it, and sometimes it took longer, so you had to wait in line! From buying a mobile phone to opening an account, it will cost about 38, yuan to complete the formalities, and it will take about one month to use it. The call fee seems to be 8 cents, and the signal at that time was very bad, so the call will be disconnected from time to time. Later, in 1995, in Shenzhen, mainland China, China Mobile Company began to launch three initiatives, one was to pay the money in one hand, and the other was to hand in the mobile phone, which was opened and used on the same day. At that time, the Internet access fee was very high, and the monthly rent for 15 yuan was 6 cents a minute! Expensive!