AdMob published it's June report, showing detailed statistics about smartphone market. As for iPhone 54% of iPhone OS devices are currently in the US; however, this number has slowly declined from 61% in the last six months, implying that international users are growing faster than those in the US. Following the US, the United Kingdom, Germany, and France each have over 5% of users. As a region, Western Europe has a 26% share of iPhone and iPod touch users.

Based on Apple guidance, the company has shipped 26.4 million iPhones and approximately 18.6 million iPod touches to date.

Here is a table, that shows the number of iPhones by country:

Here's some interesting statistics about smartphone traffic. Sounds like Apple is looking quite good in both the US and the rest of the world:

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You can take a look at this report here ^[3].