AdMob's latest statistics show that only 4% of iPhones receiving ads from their network are still on 2.x (17% on 3.0 and 80% on 3.1). 32% of iPod touches are still on 2.x (8% on 3.0, 60% on 3.1). However, these statistics are for devices using ad-supported applications.
In the case of the iPod touch numbers, I would imagine that a large portion of the non-upgraded people are either too cheap to pay the $5 fee to upgrade or have no idea that an upgrade is even available. These are not a prime target audience for for-pay applications, something backed by my experience in advertising to the AdMob crowd. When I restricted ads for my application to just 3.x users, I saw a much higher conversion rate than when including 2.x users.
The early Tapbots figures that Mike pointed out tell a very different story in terms of adoption rates than did AdMob's numbers at the time. This is probably based on the fact that people who had purchased their application were more likely to be ones that would update their OS.
At this point, handicapping yourself by not using 3.x features in order to target 2.x holdouts is not a wise move in my opinion.
iPhone users are somewhere in high nineties by now, I believe, with iPod users substantially lower. However, you shouldn't worry about supporting 2.0 users. If an iPod user isn't willing to spend $10 to substantially improve their device, chances are they're not going to pay money for your app.
According to http://imgur.com/khSnV.png 94% of the iPhone users already upgraded to 3.x. If you have a lot of iPod Touch customers you should support 2.x since only 55% upgraded to 3.x.
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AdMob 的最新统计数据显示，只有 4% 的 iPhone 接收来自其网络的广告仍然在 2.x 上（17% 在 3.0 上，80% 在 3.1 上）。 32% 的 iPod touch 仍使用 2.x（8% 使用 3.0，60% 使用 3.1）。但是，这些统计数据适用于使用广告支持应用程序的设备。
就 iPod touch 的数量而言，我可以想象很大一部分未升级的人要么因为价格太便宜而无法支付 5 美元的升级费用，要么根本不知道可以升级。这些人并不是付费应用程序的主要目标受众，这一点得到了我向 AdMob 人群做广告的经验的支持。当我将应用程序的广告限制为仅限 3.x 用户时，我发现转化率比包含 2.x 用户时高得多。
迈克指出的早期 Tapbots 数据讲述了一个非常不同的情况就采用率而言，这个故事比当时 AdMob 的数据要好得多。这可能是基于这样一个事实：购买了他们的应用程序的人更有可能更新他们的操作系统。
在这一点上，我认为，为了针对 2.x 的抵制者而不使用 3.x 功能来限制自己并不是明智之举。
AdMob's latest statistics show that only 4% of iPhones receiving ads from their network are still on 2.x (17% on 3.0 and 80% on 3.1). 32% of iPod touches are still on 2.x (8% on 3.0, 60% on 3.1). However, these statistics are for devices using ad-supported applications.
In the case of the iPod touch numbers, I would imagine that a large portion of the non-upgraded people are either too cheap to pay the $5 fee to upgrade or have no idea that an upgrade is even available. These are not a prime target audience for for-pay applications, something backed by my experience in advertising to the AdMob crowd. When I restricted ads for my application to just 3.x users, I saw a much higher conversion rate than when including 2.x users.
The early Tapbots figures that Mike pointed out tell a very different story in terms of adoption rates than did AdMob's numbers at the time. This is probably based on the fact that people who had purchased their application were more likely to be ones that would update their OS.
At this point, handicapping yourself by not using 3.x features in order to target 2.x holdouts is not a wise move in my opinion.
我相信，iPhone 用户目前已达到 90 多岁，而 iPod 用户则要低得多。但是，您不必担心支持 2.0 用户。如果 iPod 用户不愿意花费 10 美元来大幅改进他们的设备，他们很可能不会为您的应用程序付费。
iPhone users are somewhere in high nineties by now, I believe, with iPod users substantially lower. However, you shouldn't worry about supporting 2.0 users. If an iPod user isn't willing to spend $10 to substantially improve their device, chances are they're not going to pay money for your app.
总体采用率似乎在 20% 到 75% 之间。
请参阅http://tapbots.com/blog/news/iphone-os -30-采用率，http://arstechnica.com/apple/news/2009/06/whats-the-uptake-on-iphone-os-30.ars，http://metrics.admob.com/2009/ 06/44-of-iphone-ad-requests-coming-from-the-30-os/。
这是通过谷歌搜索
iPhone OS 3.0 采用率发现的。Looks like anywhere from ~20%-~75% adoption overall.
See http://tapbots.com/blog/news/iphone-os-30-adoption-rate, http://arstechnica.com/apple/news/2009/06/whats-the-uptake-on-iphone-os-30.ars, http://metrics.admob.com/2009/06/44-of-iphone-ad-requests-coming-from-the-30-os/.
This was found by googling
iPhone OS 3.0 adoption rate.根据 http://imgur.com/khSnV.png 的说法，94% 的 iPhone 用户已经升级到3.x。如果您有很多 iPod Touch 客户，您应该支持 2.x，因为只有 55% 升级到 3.x。
According to http://imgur.com/khSnV.png 94% of the iPhone users already upgraded to 3.x. If you have a lot of iPod Touch customers you should support 2.x since only 55% upgraded to 3.x.