invoking a call fom BB code

I need开发者_如何学C to invoke a call from code how can i do it ?

I tried Phone arguements but it did not worked ?

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PhoneArguments phoneArgs;
phoneArgs = new PhoneArguments(PhoneArguments.ARG_CALL, 
    lbl_Phone_value.getText());
Invoke.invokeApplication(Invoke.APP_TYPE_PHONE, phoneArgs);