Method and apparatus for cost-saving telephone service

A method for a cost-saving telephone service, which is performed by a user, comprising:

• proposing, by a communication resource using device, a request for calling a third party client device, wherein the communication resource using device is a first client device registered to the cost-saving telephone service of a server, and is connected to the server through a data network, the communication resource using device and the third party client device are respectively connected to a first telephone service network and a second telephone service network, and the first telephone service network and the second telephone service network are managed by different telephone service providers;
• and
• communicating, by the communication resource using device, with the third party client device via a communication resource providing device without being charged with an inter-network charge rate, wherein the communication resource providing device is selected by the server from a plurality of second client devices registered to the cost-saving telephone service and connected to the second telephone service network, and the communication resource providing device is connected to the server through the data network, and the communication resource providing device calls the third party client device through the second telephone service network.