According to a study by ABI Research, the iPhone had 1.1% of the overall world mobile phone market share (not just smartphones) at the end of 2008.
Source(s):
http://www.networkworld.com/news/2009/013009-iphone-takes-11-of-the.html

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When talking about market share, you need to specify what market you're talking about. Mobile phones? Smartphones?

And presumably you are interested in the number of devices as opposed to say revenue share for the device, revnue from calls, or share of call volume.

The latest estimate seems to that there are 4.1 billion mobile phone users worldwide. iPhone total sales at the last count were around 17m.

So currently iPhones account for 0.4% of mobile phones worldwide.

http://telecompk.net/2009/03/03/41-billion-mobile-phone-subscribers-worldwide/

http://www.itu.int/ITU-D/ict/publications/idi/2009/index.html

http://www.148apps.com/news/apple-posts-q1-2009-results-stands-crowd/
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