Just compare it to Android's smartphone marketshare:
In Q4/2009 Apple sold around 9 million iPhones. In Q4/2010 they almost doubled that number to 16.2 million, but still lost marketshare!
Same with Nokia: They sold 7 million more smartphones in Q4/10 than they did in Q4/2009 but also lost marketshare.
Android on the other hand increased their sales by over 600%(!) and sold over 33 million smartphones in Q4/2010 while they only sold about 5 million in Q4/2009.
So while Apple and Nokia are selling smartphones like crazy they still can't compete with the momentum Android got.
And what's even more crazy when you compare the total shipments number: About 65% (30million out of 50 million) of new smartphone buyers bought an Android phone.