The iPhone is now responsible for 7.8% of all smart phone traffic in the U.S., up from 5.2% last month. It's important to note that this does not necessarily reflect the actual market share of the iPhone, as iPhone users, thanks to the ease of use of the iPhone user interface, are probably spending more time online on their devices than most other smartphone users.

What About Nokia, Palm, Motorola, and Rim?

While Nokia devices were responsible for just over 62% of all smartphone traffic worldwide, none of Nokia's smartphones ranked in the top 20 in the U.S. Palm's Centro, on the other hand, looks like a major boon for the company, as it is only trumped by the Blackberry Pearl when it comes to traffic volume.

Motorola, which does not have a single smartphone ranked in the top 20, still dominates the mobile traffic rankings with its RAZR V3. which was responsible for 3.7% of all mobile Internet use worldwide in August. The iPhone was the 17th most used phone on the mobile web and generated 1% of all worldwide traffic, up from 0.6% in July.

The iPhone is clearly growing quickly in the U.S. and now that Apple seems to have gotten its supply chain under control, chances are that it will continue on this track. However, it is also important to point out that, in the overall market, Apple is still only a small player. Most users, according to AdMob, are still accessing the mobile web on a RAZR.