Jason Toff, marketing manager for Google Voice, demonstrates how to make a call from a red phone booth at the Google office in San Francisco, Wednesday, Aug. 25, 2010. Google plans to promote the Google Voice service by setting up red phone booths at universities and airports scattered across the United States. People will be able to make free calls from the booths to U.S. and Canadian numbers and save on international calls.  (AP Photo/Jeff Chiu)

Photo by: Jeff Chiu

Jason Toff, marketing manager for Google Voice, demonstrates how to make a call from a red phone booth at the Google office in San Francisco, Wednesday, Aug. 25, 2010. Google plans to promote the Google Voice service by setting up red phone booths at universities and airports scattered across the United States. People will be able to make free calls from the booths to U.S. and Canadian numbers and save on international calls. (AP Photo/Jeff Chiu)