According to Techtree [link], Apple is supposed to sell 5 mln. iPhone and iPhone 3G devices totally worldwide by end of Q4 2008.

Let’s stop a little and see - how much is really 5 million devices in the grand scale of things?

There is a total of 3 billion handsets worldwide, and Nokia leads, with about 1 billion handsets sold worldwide (37% market share). On the grand scale of things, this gives iPhone a 0,16% market share worldwide. 
What is to come next? Well if iPhone sells 5 - 10 million devices every year, they will in 3 years have a 1% marketshare globally, which is impressive for just one series of handsets, but in that time other manufacturers will copy, and copy well.
Just for comparison: There are 200 million Symbian devices (source)

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