WP7 USSD Dialer Application

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Windows-Phone-7

I'm trying to design an application using a launcher that can dial USSD codes. When i run the application from the device, i get an error message stating that service codes can only be dialed from the device's keypad.

Im using this code:

PhoneCallTask ussd = new PhoneCallTask();   
ussd.PhoneNumber = "*111#";   
ussd.DisplayName = "Service Info";   
ussd.Show();

What this should be doing it dialing the ussd number and then returning a menu. But it wont dial.

Does anyone know a solution for this?

The odd thing is that you are able to save a USSD (for example *111#) in your contacts and then dial from there without having to type the number using the keypad.