Google will provide free wireless Internet access service to its hometown of Mountain View, Calif. in a phased rollout that begins this summer. Volunteers providing feedback for the project can sign up for Wi-Fi this summer, with public service coming available later this year. Meanwhile, Google is working with Earthlink to blanket San Francisco with a free Wi-Fi service across its 49-square miles. Security and privacy concerns have kept city officials talking, but radiation concerns have been laid to rest. It turns out cell phones emit more powerful radiation than wireless radio equipment.