Using WCF service for windows mobile and server communication ?

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Windows

Mobile

WCF

JSON

I am using this code for (Windows phone and server communiction using WCF )[How to Consume WCF REST Service Returning JSON in Windows Phone 7] for sending my data from phone to server and get response. But i am getting error "The remote server returned an error: NotFound."

How this Uri is created

string ServiceUri = "http://localhost:30576/Service1.svc/Rest/add/"+ Number1 +"/"+ Number2;

I did not understand from where "/Rest/add/" came from . I may be getting error due to this .