Why is voice phone the "king of mobile phones in Africa"?

As we all know, Africa is an economically backward place, and cheap mobile phones are more popular. Take the latest TECNO Spark 7 mobile phone as an example, the price is 7499 rupees, which is almost less than that of 660 yuan. TECNO also belongs to the high-end products among the three major mobile phone brands. Infinix is younger and itel is more cost-effective, which is in line with the consumption power of African people. Secondly, according to the characteristics of African users, a number of functions of voice phones have been designed and developed, such as dark skin camera technology and large-capacity batteries, which can achieve extraordinary endurance ... So voice phones quickly occupied the entire African market in just a few years and became the most popular mobile phone in Africa. According to the data, the sales volume of foreign voice mobile phones exceeds 1 100 million units, ranking fourth in the world's mobile phone sales list and first in Africa. It is a well-deserved "king of mobile phones in Africa".