问题
I am trying to find out how many of the active iPhone and iPod touch users have at least 3.0 OS installed.
I need to know if the percentage running 2.x is still considerable or not really.
I tried looking into AdMob stats, and other OS usage stats sites, but I can't get to see iPhone 2.x vs iPhone 3.x
回答1:
As of January 2010, shortly before the release of 3.1.3:
At around 30,000 downloads (mostly in Austria, some in Germany) for one of our free apps, there are fewer than 5% of devices still on 2.2.1 or older (as reported by UIDevice).
Less than a quarter was not on the latest OS Release (3.1.2 at the time).
回答2:
It's good to know the ratio 2.x VS 3.x but you may also ask yourself "Let's consider someone who is still using 2.x : is this person really a potential user of your app or an appstore user ?" . In my opinion : no.
So targeting below 3.0 does not make any sense IMHO.
回答3:
Quick note, referring to iPhone OS 2.1.1 in user agent is used by most bots which claim to be iPhone.
回答4:
After a look around, I have found this (which hopefully, will be of some use to you): http://tapbots.com/blog/news/iphone-os-30-adoption-rate
Hope this helps!
(Data from: June 23rd, 2009)
回答5:
Check out flurry.com. They have a free SDK that take about two lines of code to start tracking all kinds of cool details like OS version, type of device, device version, location, what wireless carrier was used, WI-FI use, etc.
回答6:
http://insights.chitika.com/2011/ios-update-ipads-iphones-running-high-rate-of-ios-4/
More recent data. (Bottom line: 4.0+ is effectively ubiquitous on iPhones--91% adoption.)
回答7:
I usually use Chitika
http://insights.chitika.com/2011/just-in-time-for-ios-5-ios-3-almost-dead/
来源：https://stackoverflow.com/questions/2416240/iphone-os-current-usage-statistics-esp-2-x-vs-3-x