It's not that China has a billion cell phone users... hell, they have 1.3 billion people so having that many cell phone users doesn't stretch credibility. No, my issue is that 103.9% percent number for the US. I understand that might mean some people have more than one phone, but still: wouldn't that be 100% penetration and no more? I used to HATE asshats that told me they wanted a "110% effort" or some other bullshit like that. You got all o' sumthin'? That's 100%... you can't get any more than that.China, the world’s most populous nation, is the first country in the world to reach 1 billion mobile subscribers. According to the country’s Ministry of Industry and Information Technology, mobile phone subscriptions in China had reached 997 million by late February, and were expected reach one billion by the end of the month, AllThingsD reported. In 2007, China’s mobile market surpassed 500 million subscribers; if the MIIT’s figures are correct, the market has doubled in the last five years. Out of China’s roughly 1.3 billion citizens, 73.6% of the population own a cell phone. In the United States, cell phone penetration is currently estimated to be approximately 103.9%.