Can't pass login with SMS web services from xmethods.net in C#

[mulevad]

Hello,

I am trying to send a text message to my phone in C#.
I have added a Web Service Reference to my solution.
It is described as:
vijju311985 RPC SMS Services You Can Send Sms for free

The WSDL is at:
http://www.aswinanand.com/sendsms.php?wsdl

I created an account on xmethods.net and was able to instantiate the reference as "asend".

Here is the code:

protected void Button3_Click(object sender, EventArgs e)
    {
        string uid = "4403610112";
        string pwd = "<withheld>";
        string phone = uid;
        asend.SendSMS sms1 = new asend.SendSMS();
        Label5.Text = sms1.sendSMSToMany(uid, pwd, uid, TextBox3.Text.ToString());
    }

The return value placed in Label5.Text is "invalid login". The uid and pwd match my account for xmethods.net.

The message board on the website has only 9 entries. Two of them are for "invalid login". There are no solutions.

Has anyone here had any luck with sending an SMS message via ANY web service?

Any help would be appreciated.

p.s. I've also tried the other two SMS web services listed on this site with similar results.