Global mobile ad spending will reach $913.5 million, up 74 percent this year. However, it does not really accelerate until 2011, according to a new Gartner report, "as advertisers are expected to boost mobile spending as part of an overall shift toward digital marketing channels," MediaPost reported.

The spending will exeed $13 billion by 2103, with Asia Pacific leading the way, followed by North America and Europe

The trend will boost after 2011 as smartphones and flat-rate data plans become more affordable to users. "The growth in mobile advertising revenues is primarily driven by mobile Web banner ads, but it also has a strong growth component from mobile search, downloadable applications and SMS advertising," according to the report, titled "Mobile Advertising Grows Quietly"

In 2013, Gartner expects smartphones to account for 45.5 percent of all mobile phone sales, compared to just 9 percent in 2008, MediaPost reported.

While data usage is increasing most rapidly among smartphone users, "the increased mobile media consumption is leading Web publishers to create more user-friendly versions of their mobile sites, which in turn is lifting mobile Web access among non-smartphone users," said Gartner analyst Andrew Frank.