If you ever need to log what a wcf service is doing here's how to. Go to your web.config or app.config file and start adding this

app.config

    <system.serviceModel>
       <!-- ... -->
        <diagnostics>
            <messageLogging logEntireMessage="true" logMalformedMessages="true"
                logMessagesAtServiceLevel="true" logMessagesAtTransportLevel="true" />
        </diagnostics>
    </system.serviceModel>
    <system.diagnostics>
        <sources>
            <source name="System.ServiceModel" switchValue="Warning, ActivityTracing"
                propagateActivity="true">
                <listeners>
                    <add type="System.Diagnostics.DefaultTraceListener" name="Default">
                        <filter type="" />
                    </add>
                    <add name="ServiceModelTraceListener">
                        <filter type="" />
                    </add>
                </listeners>
            </source>
            <source name="System.ServiceModel.MessageLogging" switchValue="Warning, ActivityTracing">
                <listeners>
                    <add type="System.Diagnostics.DefaultTraceListener" name="Default">
                        <filter type="" />
                    </add>
                    <add name="ServiceModelMessageLoggingListener">
                        <filter type="" />
                    </add>
                </listeners>
            </source>
        </sources>
        <sharedListeners>
            <add initializeData="C:\tracelog.svclog"
                type="System.Diagnostics.XmlWriterTraceListener, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
                name="ServiceModelTraceListener" traceOutputOptions="Timestamp">
                <filter type="" />
            </add>
            <add initializeData="C:\messages.svclog"
                type="System.Diagnostics.XmlWriterTraceListener, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
                name="ServiceModelMessageLoggingListener" traceOutputOptions="Timestamp">
                <filter type="" />
            </add>
        </sharedListeners>
        <trace autoflush="false" />
    </system.diagnostics>