Tianjin is the largest coastal city in northern China. In terms of urban population, Tianjin is the fourth largest in China, after Shanghai, Beijing, and Guangzhou. In terms of administrative area population, Tianjin ranks fifth in Mainland China. The walled city of Tianjin was built in 1404. As a treaty port since 1860, Tianjin has been a major seaport and gateway to Beijing. During the Boxer Rebellion the city was the seat of the Tianjin Provisional Government. Under the Qing dynasty and the Republic of China, Tianjin became one of the largest cities in the region. At that time, numerous European-style
Mobile phone industry in China Mobile phone industry in China China's mobile phone industry of cell phone industry has high growth rate, raising its share on the global mobile phone market. During 2007, 600 million mobile phones were made in China which accounted for over 25 percent of the global production. China is the largest market in terms of mobile phone subscribers. After the 2008 reorganization of China's telecommunication industry, there are now three mobile phone service providers. China Mobile () continues the old China Mobile's service, absorbed China Railway Communications, and began 3G service using TD-SCDMA, China's disputed own technology. China Unicom () continues