Thisis a pageaboutpostalcodeof "Zhen An Zhen Yong Feng Cun Wei Qin Qing , Yun'an County, Yunfu City, Guangdong Province, China", with areainformationandonlinemap.
To roughly calculate, I build on a study of 120 countries by Christine Zhen-Wei Qiang of the World Bank that found that a 10 percent increase in mobile phone penetration correlates with a 0.8 percent average increase in GDP growth.