[inquisitor]

When a friend of mine, who had bought his Blackberry Bold 9000 on contract from O2 Germany, moved to Switzerland, he was not able to register for Blackberry service with Swisscom because his handset was tied to an existing Blackberry account, from which only O2 could unregister it. Afaik a Blackberry handset is always tied to an account with Blackberry, which can only be created or deleted by operators. So I fear even if you unlock your Blackberry, you won't be able to use it in Italy unless your Canadian provider releases it, so you can re-register an Italian provider can re-register it for Blackberry service.