Shoutbox

I am thinking of buying a Nokia 6630 on the 3 Network tomorrow from phones 4 u for £90.
I do not like the 3 network and would like to use my previous Virgin Mobile sim card within the phone, I am having doubts if phones locked to the 3 network are eligble for unlocking to all networks.
If they are, I shall get it unlocked from a local unlocking shop near Phones 4 u.

Could someone just clarify if it will be at all possible?
Hyped