Yesterday, Google announced that Number Porting is now available for Google Voice users. Today, the company continues its development of Google Voice with the acquisition of social voice company SayNow, and marketers may like how new developments influence their click-to-call campaigns.

Google explained that it is now letting users bring their existing phone numbers to Google Voice. Consumers will make their current numbers their Google Voice numbers, and then cancel their service plans. Consumers then get a new service plan and new mobile number, but have Google Voice calls (read: all calls to their primary numbers) forwarded to their mobile lines.

SayNow announced that Google has acquired it in an effort to bring new Google Voice options to users. Google insiders told eWeek that they like the community services SayNow has already built.

Though there are no announcements about specific products or services in the works, many speculate this will bring new social components to Google Voice. These may include click-to-call features in social ads, or other social calling features.

Marketers may want to follow any mobile developments from Google Voice, as evidence suggests that click-to-call ads pay off. Jonathan Rosenberg, senior vice president of product management at Google, recently told RCR Wireless that click-to-call ads generate millions of calls each month.