The disclosure relates to accessing computer resources by sensing audio with a microphone. One claim recites a method comprising: obtaining data in a first user's cell phone, the data corresponding to microphone-captured audio; responsive to the data, the first user's cell phone receiving a service provided by a first party, the service comprising facilitating access to a computer resource over a network; in which the first user does not provide a fee to the first party for the service, as the first party bills a charge connected with the service to a sponsoring party. Of course, other claims and combinations are provided as well.