Seavus covers over 30 million mobile subscribers through its clients.
In 1981, there were 30,000 mobile subscribers, which at the time made this network the largest in the world.
On average, China's mobile subscribers increased by 4.78 million each month.
He points out that the US is only ranked 48th when it comes to mobile subscribers.
By May 2012 the country had 929 million mobile subscribers, up from 350 million just 40 months earlier.
One in 11 Africans is now a mobile subscriber.
As of November 2009, there are more than 10.4 million mobile subscribers, a 300-fold increase in seven years.
They had seven million mobile subscribers in early 2012.
He believes there were just 15 million mobile subscribers when he started out.
Take an example of mobile subscriber and a base station.