From ABI Research’s “Mobile Applications Market Data”:
In Q2 2011, Android overtook iOS to become the market share leader in mobile application downloads. The market shares of Android and iOS were 44% and 31%, respectively.
Apple announced at its iPhone 4S event that it had reached its 18th billion download, meaning that Android has about 25 billion downloaded apps. update: These percentages probably refer to this year’s market share, not the overall download number.
“Despite leading in total mobile application downloads, Android’s app downloads per user still lag behind Apple’s by 2-to-1,” adds Dan Shey, practice director, mobile services.
Given both these numbers, this means that the claim that “Most Android users are upgrading their dumb phone to a smartphone without really dipping into the whole mobile app thing.” doesn’t seem to hold.
update: The massive download numbers for Android that ABI reports seems to be contradicted by the more recent numbers by Piper Jaffray. This analysis brings the download total for Android to 6,750 million, compared to 18,566 million for iOS.