[ubuntu] Mobile Broadband disabled in Ubuntu 10.10 in Dell laptop

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http://ubuntuforums.org – I have a Dell studio 1558 laptop. I have installed Ubuntu 10.10 in my laptop. Previously, i have installed 10.04 version. The mobile broadband was working properly in Ubuntu 10.04, but once I installed the new 10.10 version, the mobile broadband is not working. When I connect my mobile phone, it is detected, and I can create a new connection. But, whenever i click on the network icon, it is shown 'mobile broadband disabled' ....When I right click and select 'enable mobile broadband' , nothing happens. It still shows disabled in the network icon. I don't have access to wired internet. Please (HowTos)