Mobile Web and application usage is growing rapidly, according to mobile advertising agency AdMob.

In its latest Mobile Metrics Report, the expansion is shown to be widely spread, with 34 countries sending more than 10 million ad requests to AdMob’s network in September 2008, compared to only 16 countries in September 2007.

Celebrating its first anniversary, the reports states that since its launch the number of monthly ad requests in the AdMob network tripled from 1.6 billion in September 2007 to 5.1 billion in September 2008.

The increase is attributed to a combination of organic growth from AdMob’s legacy publishers and the addition of thousands of new mobile sites and applications to the company’s publisher network.

The number of mobile sites and applications in AdMob’s network increased to more than 6,000, with 4,308 publishers requesting ads in September 2008.

Other highlights from the September 2008 report:

Worldwide, the Apple iPhone is now the number 4 handset after the Motorola RAZR, Nokia N70, and Motorola KRZR. There were 103 million ad requests from iPhones worldwide in September 2008.

In the US, 16 of the current Top 20 devices are new from September 2007, including the Samsung Instinct and Apple iPhone.

In the UK, the Nokia N95 gained share steadily throughout the year and is now the leading handset with 9.7 per cent share of requests. The SonyEricsson K800i and W810i, the number 1 and number 5 handsets respectively in September 2007, both remain in the Top 5 a year later.

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