China Mobile is not a normal carrier. It is THE carrier.

by Me!

From AndroidAuthority.com on Samsung's smartphone lead in China:

Samsung, the new worldwide leader in smartphone sales, is the top manufacturer in China as well, with a market share of 22% of all smartphones sold in China in Q1 2012. This comes in spite of the fact that Apple released the iPhone 4S with two major Chinese carriers. The iPhone was responsible for 19% of the smartphones sold in China during the first quarter.

Let's make a small modification to the above paragraph to improve its accuracy:

Samsung, the new worldwide leader in smartphone sales, is the top manufacturer in China as well, with a market share of 22% of all smartphones sold in China in Q1 2012. This comes because of the fact that Apple released the iPhone 4S with two major Chinese carriers who are not China Mobile. The iPhone was responsible for 19% of the smartphones sold in China during the first quarter.

Fixed.