Referenced from http://metrics.admob.com/2009/12/updated-iphone-os-stats/

Updated iPhone OS Stats

December 22nd, 2009

We received a couple requests recently for the distribution of the iPhone Operating System versions we see throughout our network.  The data below represents the percentage of worldwide traffic we saw from the iPhone and iPod touch from December 14-21st.

It shows that iPod touch users lag iPhone users in upgrading their OS; 97% of our iPhone traffic comes from 3.0 or higher, compared to only 68% of iPod touch traffic.

iphone

ipod

For developers working on Android applications, platform version might become even more important than it is for iPhone given the wide variety of handsets and capabilities already available.  Fortunately, the Android team has announced a device dashboard based on devices that visit the Android Market.  Visit the Android developer blog for details or the actual dashbaord for the most recent data.

Platform Versions

This page provides data about the relative number of active devices running a given version of the Android platform. This can help you understand the landscape of device distribution and decide how to prioritize the development of your application features for the devices currently in the hands of users. For information about how to target your application to devices based on platform version, see API Levels.

Note: This data is based on the number of Android devices that have accessed Android Market within a 14-day period ending on the data collection date noted below.

Android Platform Percent of Devices
Android 1.1 0.1%
Android 1.5 24.6%
Android 1.6 25.0%
Android 2.0 0.1%
Android 2.0.1 0.3%
Android 2.1 50.0%

Data collected during two weeks ending on June 16, 2010