Just last April, we heard that China Mobile had acquired more subscribers than the entire population of the United States of America. 15 months later, it has doubled up on that figure. Yep, China Mobile has just broken the 600 million subscriber mark as the country as a whole added 53.5 million new wireless users from January to June. Consequently, fixed-line customers fell by 9.3 million to 356 million during the same window of time. So, what's the over / under on months before the carrier breaks the big 1 billion?