Once your WCF service is properly configured and you have the appropriate diagnostics setting to log the messages, you can test your WCF service and trace the full request and response using the svcTraceViewer.exe utility, which is found in the following directory: C:\Program Files\Microsoft SDKs\Windows\v6.0A\bin\SvcTraceViewer.exe  This tool will show you how .NET expects the SOAP Message Request and what .NET will return in the SOAP Message Response.  You can then use this to construct the same message using NSMutableString.  Below is a screen shot of how this tool looks, with a sample request.

So now on to the iPhone Objective-c Code.  This becomes fairly simple now.  I am not going to get into the details of how these objects work, I am just going to show you the code.  The comments within the code will tell you what is going on.  So once you have this structure set up, you will be able to call any .NET WCF Service from an iPhone Application.

- (NSMutableData*)initiateConnection{     NSMutableString *sRequest = [[NSMutableString alloc] init];
     // Create the SOAP body
    [sRequest appendString:@""];
    // This is the header section it is expecting in the body
    [sRequest appendString:@""];
    [sRequest appendString:@""];
    // This is where you pass in the user id and password.  This is sent in the body header as clear text, but since you will be using HTTPS it will be somewhat encrypted.
    [sRequest appendString:@""];
    [sRequest appendString:@""];
    [sRequest appendString:@"DIFZ"];
    [sRequest appendString:@""];
    [sRequest appendString:@""];
    [sRequest appendString:@"TheBest!"];
    [sRequest appendString:@""];
    [sRequest appendString:@""];
    [sRequest appendString:@""];
    [sRequest appendString:@""];
    // This is the body where you can pass in any parameters the WCF service expects
    [sRequest appendString:@""];
    [sRequest appendString:@""];
    [sRequest appendString:@""];
    [sRequest appendString:@""];
   
     // The URL of the Webserver
    NSURL *myWebserverURL = [NSURL URLWithString:@"https://[Server URL]/FootballPool_DAL/GameData.svc"];
    // Use the private method setAllowsAnyHTTPSCertificate:forHost:
    // to not validate the HTTPS certificate.  This is used if you are using a testing environment and have
    // a sample SSL certificate set up
    [NSURLRequest setAllowsAnyHTTPSCertificate:YES forHost:[myWebserverURL host]];
     NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:myWebserverURL];
    // Add the Required WCF Header Values.  This is what the WCF service expects in the header.
    [request addValue:@"text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
    [request addValue:@"http://tempuri.org/IGameData/GetWeeksList" forHTTPHeaderField:@"SOAPAction"];
    // Set the action to Post
    [request setHTTPMethod:@"POST"];
    // Set the body
    [request setHTTPBody:[sRequest dataUsingEncoding:NSUTF8StringEncoding]];
    // Create the connection
    NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];
    // Check the connection object
    if(conn)
    {
      myMutableData=[[NSMutableData data] retain];
    }
    // Make this class the delegate so that the other connection events fire here.
    [NSURLConnection connectionWithRequest:request delegate:self];
   
    NSError *WSerror;
    NSURLResponse *WSresponse;
    // Execute the WCF Service and return the data in an NSMutableData object
    myMutableData = [NSURLConnection sendSynchronousRequest:request returningResponse:&WSresponse error:&WSerror];
    // Return the data to the caller for processing
    return myMutableData;
}
 
+ (BOOL)allowsAnyHTTPSCertificateForHost:(NSString*)host
{
    return YES;
}
 
+ (void)setAllowsAnyHTTPSCertificate:(BOOL)allow forHost:(NSString*)host
{
}

Now that you are able to call the WCF service and retrieve the results, you need to process the returned XML.  To do this, use the NSXMLParser object.  There is a great example of how this works in the iPhone SDK.  The example is titled: seismic.  I used this sample and copied the code from it to process the returned XML.  Below is the syntax for calling the parser.

- (IBAction)btnHitMe_Click:(id)sender {
    // Create an object to the class above which is the connection to the WCF Service 
    WSCon_Weeks *DataCon = [[WSCon_Weeks alloc] init];
    // call the WCF Service above and return the NSMutableData object
    self.WeeksListData = [DataCon initiateConnection];
    // Create the XML Parser Objects
    NSXMLParser *parser = [[NSXMLParser alloc] initWithData:self.WeeksListData];
    // Set self as the delegate of the parser so that it will receive the parser delegate methods callbacks.
    [parser setDelegate:self];
    // Set Parser Options
    [parser setShouldProcessNamespaces:NO];
    [parser setShouldReportNamespacePrefixes:NO];
    [parser setShouldResolveExternalEntities:NO];
    // Begin parsing the XML
    [parser parse];
   // Refresh the picker view with the latest data
    [pvWeeksList reloadComponent:0];
    [parser release];
}