Thu, 07/10/2008 – 08:13 byAdMob, among others, has been reaping the benefits of iPhone usage growth. AdMob operates an iPhone specific ad network in addition to a more general mobile ad network. Here are some metrics and data provided by the company (which track general iPhone usage trends): Additional data from the company’s release:

• AdMob’s iPhone network served 51.8 million ads in June Worldwide, a 32 percent increase from the 39.1 million ads served in May.
• US served 34 million ads in June, up by 31 percent from the 25.9 million ads in May.

As recent Nielsen Mobile data reflect, the US has emerged as the top “mobile Internet” country:

The US, UK and Italy are leaders in mobile Internet penetration. 15.6 percent of mobile subscribers in the US, 12.9 percent of subscribers in the UK and 11.9 percent in Italy actively use the mobile Internet turning to mobile phones. We believe mobile Internet has reached a critical mass as an advertising medium in the US. As of May 2008, there were 40 million active users of the mobile Internet in the US, with individual sites that attract millions of unique users. This provides scalable marketing potential with demographic breadth.

The AdMob metrics above reflect a medium with significant reach even though the iPhone is just a fraction of the installed base of cellphone users. Here are screens from a Jaguar AdMob campaign: