Using Blackberry service
After I commissioned configured BlackBerry Mobile Phone 8100 I have found the following information on All About BlackBerry
Most common question to support@ blackberrys.se is “Getting started with service”.
This problem turns out to be due to the fact that you do not have the service connected to your SIM card. Many have also subscribed to operators that do not support Blackberry service.
“…if you do not have the Blackberry service on a subscription so you can virtually just calling and texting with a Blackberry Mobile”.
I hope this description helps many who are in the process of acquiring a Blackberry and prevent a lot of misunderstandings.