More than four out of five U.S. adults (85%) own a mobile phone, compared with seven in ten (71%) who have a landline or home phone - and nearly two-thirds of mobile phone owners (63%) agreed that their phone is very personal to them, according to a poll conducted by Harris Interactive and commissioned by Ingenio, MarketingCharts reports.

Less than a third of mobile phone owners (30%) recall seeing or hearing an advertisement on a mobile phone in the past year, suggesting that a dominant advertising model to reach the growing demographic of mobile phone users has yet to emerge, Ingenio said.

Ad-related findings:

• Regarding the kind of mobile ads they find acceptable, respondents were most favorably disposed toward sponsored text links that appear as a result of internet searches (26%).
• Close behind were audio ads that play instead of ringing when waiting for someone to answer a call (21%), and a text message from a company (20%).
• Among those who have ever called 411 from their mobile phones, commercial (74%) and restaurant (72%) phone and address listings are the most frequently sought-after types of information.
• When asked about their current and anticipated cell phone use, about half of mobile phone owners (49%) said they are already using their phones for more than just calls, including sending and receiving text messages (36%), and taking, sending and receiving photos (24%).

"An inherent difference between the mobile and PC environments is that mobile searchers want to find information and then immediately act on it," said Marc Barach, chief marketing officer, Ingenio.

"The mobile environment lets advertisers reach consumers at the point of decision, and an advertising model that connects the two when intent is at its highest will do for mobile what clicks did for the web."

MarketingCharts offers demographics-related and other findings.