More on mobile 411 related to yesterday's report: free directory assistance services such as 1-800-Free411 will ultimately overtake traditional paid assistance among mobile consumers once they become more aware of them, MediaPost reports.

"Traditional service providers, to the extent they continue to rely on user ignorance, will have to change their product offering because free 411 services will eventually cannibalize the pay services," said Greg Sterling, a senior analyst at Local Mobile Search, who authored the report on mobile directory assistance.

Some surprising statistics, quoted from the article:

- 3.1 billion of the 5 billion annual U.S. directory assistance calls are now made on cell phones.

- Most mobile consumers believe DA charges are cheaper than they actually are. About 70% estimate charges at $1 or less when they're actually closer to $2 a call.

Study: Free Mobile Directory Assistance To Overtake Paid [MediaPost]