Siemens Tc65 GPRS trouble

I've tried the following (simplified code for brevity):

ATCommand at =new ATCommand(false);

String response = ata.send("AT^SJNET=gprs,internet,\"\",\"\"\r");

HttpConnection c = (HttpConnection)Connector.open("http://www.google.nl/");

int rc = c.getResponseCode();

The last line generates the following exception: "java.io.IOException: Profile could not be activated". What does this mean and how do I fix it? (Note that if I give a 'ATD*99***#' command on a hyperterminal I do establish some kind of connection as it starts generating characters.)

[737 byte] By [EvilBroa] at [2007-11-27 4:17:14]