The invention provides marketing a telephone service that has an adapter or dongle that is functionally interposed between a telephone and a telephone utility line. The adapter is programmed to receive a voice signal and telephone number transmitted by the telephone. Based on the telephone number, the adapter determines whether to (i) pass the telephone number through to the utility line, or (ii) pass a different access number through to the utility line. A first server then receives voice signal through the telephone utility line, and to send the voice signal as a series of packets through a packet switched network to a second server. The second server is programmed to transmit and receive the voice signal to a second telephone via another telephone utility line. The service is based on a flat-fee subscription.