(Reuters) – China Mobile Ltd, the worlds largest mobile phone carrier, has quietly begun taking pre-orders for Apple Incs iPhones, according to a report on Fortune.com. China is critical to Apples growth prospects, being its biggest market after the United States. Apple fell to No. 7 in the second quarter in China, with a 5 percent market share, losing ground not just to Samsung Electronics Co Ltd but also to Chinese rivals Lenovo and ZTE Corp. The Fortune report, which could not be confirmed immediately by Reuters, showed a screen grab from a reservation website of a China Mobile subsidiary in southern China that began taking pre-orders for the iPhone 5S and the iPhone 5c late on Monday.