However, Adam Kerr, Bango's VP in North America, said that the usage in U.S. in recent weeks has risen four percent while that in the U.K. was up one percent only. He expected the U.S. to surpass the U.K. in usage by the end of August, with a nearly 23 percent and 20 percent share of the total mobile Internet market, respectively, AdWeek reported.

Kerr pointed out several drivers to the change in the report, such as that U.S. mobile carriers are aggressively building 3G networks, which greatly facilitate mobile Web-based video, which British and other European-based carriers have done years ago. Also, most of the new handsets in U.S. offer higher quality reception of video and music as well as cheaper subscriber, according to AdWeek.

The sites with most traffic tend to be those providing news, sports and weather. The spikes appear during rush hour and lunch breaks.

The increased usage will bring in more ad dollars to the space, analysts said. For example, eMarketer estimated that mobile advertising will grow from $1.6 billion in 2008 to $6.4 billion in 2012, and online video will become the most lucrative mobile ad channel by 2010, according to AdWeek.