They sold roughly a million a month in 2007 and in 2008. 4 million phones in 2007, and almost 12million in 2008. Considering the first 2-3 months were slow due to the non-subsidized cost, and the store didn't come out until June 08, I'd say the app store didn't affect iphone sales all that much right out of the box. Now that there is competition from droid, etc. it is certainly a major selling point.
They sold ok in the first year but sales really took off with the introduction of the 3G and the App Store in July 2008.
