ClickZ is reporting that Google is looking to file a patent on the technology behind a mobile click-to-call option. Click-to-call is expected to continue to grow as small businesses take advantage of search related direct advertising without the hassle of trying to convert visitors to a web site.

From the article:

The application sets forth a method of scoring ads based on the various limitations of a client device, relevance of ads to users -- both contextual and behavioral -- CPM and CPC price, user preferences, and other "performance parameters." The score would determine which ad or ads to serve, as well as whether to link the user to a Web page or connect to an advertiser via phone call.