Google's New “Pay per Call” Mobile Ads
Mobile Marketing Watch (blog)
Yesterday Google sent AdWords advertisers a message informing them of a new mobile option — Pay per call — according to Search Engine Land.
Google gets a head start in the mobile web with Pay Per CallLast Click News
Google launching “Pay per Call” mobile adsThe Next Web
Google to Add Mobile 'Click to Call' Feature to AdWordsMarketing Pilgrim (blog)

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