That looks to be a 507 error, meaning you do not have an operating system on your device. You will need to install one.
Your profile says you have the pearl. I assume the 8100. If so, follow these steps:http://www.blackberryforums.com/gene...dafone-de.html
If it is another model other than the 8100, check the sticky for your model here : General 8100 Series Discussion - Pearl - BlackBerryForums.com : Your Number One BlackBerry Community