что сие означает ?

Google is testing a new feature that lets you speak directly over the phone, for free, to businesses you find on Google search results pages. When this feature is available for a business, you'll see a green phone icon in their advertisement or a call link next to their contact information.

Here's how it works: Click the phone icon or call link, and you'll be invited to enter your own phone number into a special field. When you do so and then click Connect for free, Google will call your number almost immediately. Pick up, and you'll hear ringing on the other end as Google connects you to the business you selected. When they answer, you simply talk normally as you would with any other call.

пишут "функция click-to-call(Нажми, чтобы позвонить),которая (пишут) позволяет "позвонить в расположенные на карте магазины и фирмы/позвонить на баннер/позвонить рекламодателям/позвонить, кликнув по ссылке".

Если нужно, описание подобной технологии:
http://www.google.com/help/faq_clicktocall.html