According to Informa Report, 50 Cellular Subcriptions per 100 People

There are now approximately 3.3 billion active mobile phone connections worldwide, enough to cover half the global population, according to new data from Informa Telecoms and Media.

Wireless subscriptions have increased 18% in the past year, from 2.8 billion in late 2006, as a growing number of people buy handsets in emerging markets like India and China. The Indian market alone is expected to achieve penetration of over 40% within the next few years, up from just 13% at the beginning of 2007.

Link: http://www.teleclick.ca/2007/12/50-wireless-subscriptions-per-100-people-says-informa-report/