How many people are there in Shenzhen? No one actually knows and there are many ways of counting–hukou population, temporary population, and administrative population are the three most popular forms. However, according to “Guangdong Mobile Big Data Application Innovation Center,” in November last year an average of 25.67 million people were in Shenzhen. Of course, this population figure is the result of an algorithm, involving Mobile personal users over 18 years old who have appeared in Shenzhen, combined with Shenzhen mobile communication market share, one-person multi-card rate and the number of children aged 18 and under. But still, this figure is circulating on we chat.