First, mobile phones are not a necessity for some people, so there is no need to change them frequently. You may think that most people in the world regard mobile phones as a necessity, because they are needed for everything now, and it is more convenient to scan health codes when traveling. However, for a large part of people, mobile phones are not a necessity. You can imagine that in today's world market is full of smart phones, there are still quite a few people using elderly mobile phones, that is, non-smart phones that can only talk and send text messages.
For such people, as long as they can make a phone call, they don't need to change. And this kind of mobile phone, there is no advantage, the only advantage is the long use time. A smart phone may change its card after one year. Even if it has been used for ten or eight years, this non-smart phone may not be unable to make calls. For people who have little demand for mobile phones, there is no need to change their mobile phones frequently.
Second, to put it bluntly, it is still a word. In fact, poverty has been said so much. In the final analysis, it is because of poverty. People in this group are generally people who work hard to make money outside on their own. In their view, it doesn't matter if you change your mobile phone. They need money to do more important things. For example, children go to school, such as providing for the elderly, such as treating sick family members. Because money has more important uses, they can't change thousands or even three or four thousand, four or five thousand or even tens of thousands of mobile phones in two or three years.