Due to the rapid development of communication technology, mobile phones that have just been launched on the market are not yet fully mature in technology, so their functions in all aspects are not yet perfect. If we only focus on "new" for the sake of fashion, then the mobile phone we just bought may soon be eliminated. On the other hand, high-end new mobile phones are generally priced exorbitantly in the first period after they are launched on the market. For example, the price of Motorola V998 when it was first launched exceeded 10,000 yuan, but soon dropped to more than 3,000 yuan. Therefore, choosing the right time is very important. In addition, in terms of sound quality, there is not much difference between high-end and low-end machines. Taking the GSM system alone, there is a sense of drifting and emptiness during the call itself, so there is not necessarily much difference in sound between low-end and high-end machines that differ by thousands or even tens of thousands of yuan.