While working in a WCF Project, I got a nice link talking about WCF Test Client, its a cool application to Test WCF Services. From WCFTestClient Help

Windows Communication Foundation (WCF) Test Client (svcTestClient.exe) is a GUI tool that allows users to input test parameters, submit that input to the service, and view the response that the service sends back. It provides a seamless service testing experience when combined with WCF Service Host.

You can invoke the WCFTestClient from Visual Studio command prompt. Either using wcftestclient.exe or providing the WCFTestclient.exe with the URL of the service as the commandline parameter.

You can get more details about WCFTestClient from MSDN