Google Click-To-Call Sightings
http://www.webpronews.com/topnews/2006/02/14/google-clicktocall-sightings
Pay Per Call Advertising, Marketing & Affiliate Education.
Google Click-To-Call Sightings
http://www.webpronews.com/topnews/2006/02/14/google-clicktocall-sightings
Google Looks to Patent Mobile Click-to-call Ads
Pay-Per-Call: The Next Wave
iMediaConnection.com
ZiffLeads PPCall Ad-Feed for Publishers Offers Targeted Publishers More Valuable Call-Based Advertising Revenue Opportunity
Google Tests Pay-Per-Call Ads