Google+Voice

Google Voice provides users with a U.S. phone number. Users get to choose numbers and area codes. Inbound numbers are forwarded to other phone numbers designated by users. Outbound calls can be placed to U.S. and international numbers by dialing a Google Voice number. Inbound and outbound calls to the U.S. are free. International calls are not free. Source: wikipedia.org

To access Google Voice, you'll need to sign in. Go to @https://www.google.com/voice