How could I pass an Java-Based webservice using windows phone 7.1 client with username+password credential

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Hi All

When I call a Java-Based webservice with username+password authentication, I need to add custom SoapHeader class which is like this:

[System.Xml.Serialization.XmlTypeAttribute(Namespace="XXX")]
[System.Xml.Serialization.XmlRootAttribute("Security", Namespace="XXX",IsNullable = false)]
public class CustomSoapHeader : SoapHeader{
    public string username;
    public string password;
}

And I add customeSoapHeader property to the Proxy class also rewrite the proxy constructor method like this:

public CustomeSoapHeader cheader;
public XXXSvc(string username, string password){
    this.url = "~~~~~~~~~~~~~~";
    this.cheader = new CustomeSoapHeader(){username = username, password = password};
}

Then I add tag for each method

[System.Web.Services.Protocols.SoapHeaderAttribute("cheader")]
public int myWebMethod(param1, param2){
    // do something
}

After these steps above I can successfully call the method.

But now I need to call these web methods via a Windows Phone client. How could I pass the authentication??
I add service reference to Windows Phone App then it automatically generate the proxy reference.cs and ServiceReferences.ClientConfig
in the config file it uses basicHttpBinding, and I change the security mode to "TransportWithMessageCredential" like this:

<bindings>
    <basicHttpBinding>
        <binding name="myoWSSoapBinding" maxBufferSize="2147483647"
            maxReceivedMessageSize="2147483647">
            <security mode="TransportWithMessageCredential" />
        </binding>
    </basicHttpBinding>
</bindings>

Then I use ClientCredentials to pass through the authentication like this:

proxy.ClientCredentials.username.username = "myUserName"
proxy.ClientCredentials.username.password = "myPassword"

But can not call the method successfully.
How can I solve this problem??
Many Appreciate and thanks for your kindly help, waiting for your answers ^_^