You can put your telephone number on your PPC Ad's Ash, use the Ad Extensions bit. You don't pay unless the user clicks the number to dial it, from a smart phone or using an internet phone. Google have also notified agencies that they are cracking down on people who put the telphone number in one of the two lines of the advert, so that little trick is being closed. They say they will convert any telephone numbers to a Cost per click like the Ad Extension bit.
You can also add your address from your Google places too, plus other stuff with the same Ad Extensions section.