Officially HUGE:

“Apple has enormous respect for China Mobile and we are excited to begin working together. China is an extremely important market for Apple and our partnership with China Mobile presents us the opportunity to bring iPhone to the customers of the world's largest network,” said Tim Cook, Apple CEO. “iPhone customers in China are an enthusiastic and rapidly growing group, and we can’t think of a better way to welcome in the Chinese New Year than getting an iPhone into the hands of every China Mobile customer who wants one.

”China Mobile now has over 1.2 million 2G/GSM, 3G/TD-SCDMA, 4G/TD-LTE base stations and over 4.2 million Wi-Fi access points, providing broad coverage to quality networks for iPhone 5s and iPhone 5c customers. China Mobile is rolling out the world’s largest 4G network. 

By the end of 2013, China Mobile’s 4G services will be available in 16 cities including Beijing, Shanghai, Guangzhou and Shenzhen. By the end of 2014, China Mobile plans to complete the rollout of more than 500,000 4G base stations, which will cover more than 340 cities with 4G service. 

The collaboration between Apple and China Mobile will give a big boost to the development of China's homegrown 4G/TD-LTE technology. iPhone on China Mobile supports major cellular network standards, making a global phone a reality for China Mobile customers.