UK BlackBerry Storm

[ian-m]

Hi, im interested in buying a Storm and as you may know it is only available on vodafone at the moment.
I've looked around and found a site selling it on contract with a better contract than anywhere else is offering however a message comes up on the site saying if you wish to port your current phone number over that you can't as its currently unavailable.
Does that mean all Storms or just because ive ordered it through this site?
And if i were to buy it, would i be able to just put my current 02 sim card in the storm instead so i can keep my number?
thanks